Faith in Christ is merely the mode of entering the religious covenant, the new grace covenant of God, that replaced the Mosaic law/covenant. Paul never taught anything like "faith alone", it was a wrong translation and interpretation by Martin Luther who was clearly influenced by the agenda to justify sin by creating a lawless licentious theology, by twisting Paul as the early heretics did (2 Pet 3:16-17). Faith without the law, does not mean faith alone, as Luther believed. The NT consistently teaches, that Faith or religion without works are dead.
Endurance, perseverance to the end, works, holiness, commandments are all works that can be summed up in obedience to God. Even Paul consistently taught that the final judgment of every man is according to works, not religion; and only the obedience to God, that is the righteous works or love trumps faith. So none of those concepts or instructions should be seen as confusing and contradictory, as all of them, including Faith in Christ, are part of obedience to God.
[NASB 1 Cor 7:19-20] Circumcision is nothing, and uncircumcision is nothing, but [what matters is] the keeping of the commandments of God. Each man must remain in that condition in which he was called.
[NASB Gal 5:6] For in Christ Jesus neither circumcision nor uncircumcision means anything, but faith working through love.
[ESV Matt 7:21-27] “Not everyone who says to me, ‘Lord, Lord,’ will enter the kingdom of heaven, but the one who does the will of my Father who is in heaven. On that day many will say to me, ‘Lord, Lord, did we not prophesy in your name, and cast out demons in your name, and do many mighty works in your name?’ And then will I declare to them, ‘I never knew you; depart from me, you workers of lawlessness.’ “Everyone then who hears these words of mine and does them will be like a wise man who built his house on the rock. And the rain fell, and the floods came, and the winds blew and beat on that house, but it did not fall, because it had been founded on the rock. And everyone who hears these words of mine and does not do them will be like a foolish man who built his house on the sand. And the rain fell, and the floods came, and the winds blew and beat against that house, and it fell, and great was the fall of it.”
addendum
I have been asked to provide more citation to substantiate my answer. If someone objects to lack of citation for a particular statement, then let me know in the comments. I believe as Paul wrote extensively, that the culmination & termination of the Mosaic law covenant does not mean that God has abandoned his justice and there is no law binding upon man (Romans 6-8), but that we are to live as servants of God, and believers ought to work out your own salvation with fear and trembling (Phil 2:12), and consecrate themselves as a drink offering, running the race to the end in order to win it, (1 Cor 9:24). Everyone will be judged impartially. Religion or genealogy makes no difference, for this was the whole essence of Jesus ministry, as he taught that those who killed the prophets and who were going to kill him were the very people of faith (Luke 3:8, John 8:33, Luke 10:25-37). The parables of Jesus are the best & unequivocal sources to determine who will inherit the kingdom of heaven, see for example, Matthew 25, parable of Talents.
Following is a quote from the founder of Faith alone doctrine, which I believe cannot logically include works, it is inherently lawless or antinomian. It is a logical impossibility to include any work in faith-alone dogma. Works of righteousness are mutually exclusive as a married bachelor or a square circle with the faith-alone doctrine of Luther.
"Be a sinner, and let your sins be strong, but let your trust in Christ be stronger, and rejoice in Christ who is the victor over sin, death, and the world. We will commit sins while we are here, for this life is not a place where justice resides... No sin can separate us from Him, even if we were to kill or commit adultery thousands of times each day" ['Let Your Sins Be Strong, from 'The Wittenberg Project;' 'The Wartburg Segment', translated by Erika Flores, from Dr. Martin Luther's Saemmtliche Schriften, Letter No. 99, 1 Aug. 1521. - Cf. Also Denifle’s Luther et Lutheranisme, Etude Faite d’apres les sources. Translation by J. Paquier (Paris, A. Picard, 1912-13), VOl. II, pg. 404].
A few passages from the New Testament:
[Mat 5:20 ASV] For I say unto you, that except your righteousness
shall exceed [the righteousness] of the scribes and Pharisees, ye
shall in no wise enter into the kingdom of heaven.
[Mat 5:46-48 ASV] For if ye love them that love you, what reward have
ye? do not even the publicans the same? And if ye salute your brethren
only, what do ye more [than others?] do not even the Gentiles the
same? Ye therefore shall be perfect, as your heavenly Father is
perfect.
[Mat 16:27 ASV] For the Son of man shall come in the glory of his
Father with his angels; and then shall he render unto every man
according to his deeds.
[Mat 18:3 ASV] and said, Verily I say unto you, Except ye turn, and
become as little children, ye shall in no wise enter into the kingdom
of heaven.
[Act 10:34-36 ASV] And Peter opened his mouth, and said, Of a truth I
perceive that God is no respecter of persons: but in every nation he
that feareth him, and worketh righteousness, is acceptable to him. The
word which he sent unto the children of Israel, preaching good tidings
of peace by Jesus Christ (he is Lord of all)--
[Rom 2:6-16 ASV] who will render to every man according to his works:
to them that by patience in well-doing seek for glory and honor and
incorruption, eternal life: but unto them that are factious, and obey
not the truth, but obey unrighteousness, [shall be] wrath and
indignation, tribulation and anguish, upon every soul of man that
worketh evil, of the Jew first, and also of the Greek; but glory and
honor and peace to every man that worketh good, to the Jew first, and
also to the Greek: for there is no respect of persons with God. For as
many as have sinned without the law shall also perish without the law:
and as many as have sinned under the law shall be judged by the law;
for not the hearers of the law are just before God, but the doers of
the law shall be justified; (for when Gentiles that have not the law
do by nature the things of the law, these, not having the law, are the
law unto themselves; in that they show the work of the law written in
their hearts, their conscience bearing witness therewith, and their
thoughts one with another accusing or else excusing [them]); in the
day when God shall judge the secrets of men, according to my gospel,
by Jesus Christ.
[Rom 6:16 ASV] Know ye not, that to whom ye present yourselves [as]
servants unto obedience, his servants ye are whom ye obey; whether of
sin unto death, or of obedience unto righteousness?
[1Co 7:19 ASV] Circumcision is nothing, and uncircumcision is nothing;
but the keeping of the commandments of God.
[2Co 5:10 ASV] For we must all be made manifest before the
judgment-seat of Christ; that each one may receive the things [done]
in the body, according to what he hath done, whether [it be] good or
bad.
[1Pe 1:15-17 ASV] but like as he who called you is holy, be ye
yourselves also holy in all manner of living; because it is written,
Ye shall be holy; for I am holy. And if ye call on him as Father, who
without respect of persons judgeth according to each man's work, pass
the time of your sojourning in fear:
[Rev 20:12 ASV] And I saw the dead, the great and the small, standing
before the throne; and books were opened: and another book was opened,
which is [the book] of life: and the dead were judged out of the
things which were written in the books, according to their works.
[Rev 22:11-12 ASV] He that is unrighteous, let him do unrighteousness
still: and he that is filthy, let him be made filthy still: and he
that is righteous, let him do righteousness still: and he that is
holy, let him be made holy still. Behold, I come quickly; and my
reward is with me, to render to each man according as his work is.