Eternity is called whole, not because it has parts, but because it is lacking in nothing.

The existence of a prime mover- nothing can move itself; there must be a first mover. The first mover is called God.

So, to detract from the perfection of creatures is to detract from the perfection of divine power.

Mercy without justice is the mother of dissolution; justice without mercy is cruelty.

The soul is perfected by knowledge and virtue.

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.

Secondly, man sins against nature when he goes against his generic nature, that is to say, his animal nature. Now, it is evident that, in accord with natural order, the union of the sexes among animals is ordered towards conception. From this it follows that every sexual intercourse that cannot lead to conception is opposed to man's animal nature.