It is altogether unlawful to kill oneself... Wherefore suicide is contrary to the inclination of nature, and to charity whereby every man should love himself... Life is God's gift to man, and is subject to His power, Who kills and makes to live. Hence whoever takes his own life, sins against God... for it belongs to God alone to pronounce sentence of death and life.
Thomas AquinasBestow upon me, O Lord my God, understanding to know thee, diligence to seek thee, wisdom to find thee, and a faithfulness that may finally embrace thee.
Thomas AquinasIt [covetousness] is a sin against God, just as all mortal sins, in as much as man condemns things eternal for the sake of temporal things.
Thomas AquinasAn act of love always tends towards two things; to the good that one wills, and to the person for whom one wills it.
Thomas Aquinas