Pope Francis in his speech at the conclusion of the Synod 2014, said
One, a temptation to hostile inflexibility, that is, wanting to close oneself within the written word, (the letter) and not allowing oneself to be surprised by God, by the God of surprises, (the spirit); within the law, within the certitude of what we know and not of what we still need to learn and to achieve. From the time of Christ, it is the temptation of the zealous, of the scrupulous, of the solicitous and of the so-called – today – “traditionalists” and also of the intellectuals.
The temptation to a destructive tendency to goodness [it. buonismo], that in the name of a deceptive mercy binds the wounds without first curing them and treating them; that treats the symptoms and not the causes and the roots. It is the temptation of the “do-gooders,” of the fearful, and also of the so-called “progressives and liberals.”
Do we know who is credited with being the first to use these terms "conservatives", “traditionalists”, “progressives and liberals” for describing certain groups within the Catholic Church? When was that?
How are these labels understood within the Church?