Chapter — Slater, Manual of Moral Theology
Chapter III. On Contrition
1.
Contrition is the first of the acts of the penitent which constitute the matter of the sacrament of Penance, It is defined by the Council of Trent to be a heartfelt sorrow and detestation of sin committed, with a purpose of not sinning again. In this section we will treat of contrition apart from the purpose of amendment, and in the following section, of the purpose of amendment.
p. ii, 132