Habit and despair are stages following the complete species of sin, even as boyhood and youth follow the complete generation of a man.
 Thomas Aquinas, Summa Theologica (1274). copy citation

add
Author Thomas Aquinas
Source Summa Theologica
Topic youth despair
Date 1274
Language English
Reference
Note Translated by Fathers of the English Dominican Province
Weblink http://www.gutenberg.org/cache/epub/17897/pg17897-images.html

Context

“distinguishes between them, because in sins of word there is nothing but manifestation which is intended principally; while in sins of deed, it is the consummation of the inward thought which is principally intended, and the outward manifestation is by way of sequel. Habit and despair are stages following the complete species of sin, even as boyhood and youth follow the complete generation of a man. Reply Obj. 3: Sin of thought and sin of word are not distinct from the sin of deed when they are united together with it, but when each is found by itself: even as one part of a movement is not distinct from the whole movement, when the movement is continuous, but only when there is a break in the movement.” source