Not to appreciate life, all of life, is not to deserve it.

Old age takes in part savoury wisdom for its food - see to that your old age will not lack in nourishment.

Wood feeds the fire which burns it.

We must doubt the certainty of everything which passes through the senses, but how much more ought we to doubt things contrary to the senses, such as the existence of God and the soul.

One day the world will look upon research upon animals as it now looks upon research on human beings.

Nature is full of infinite causes that have never occurred in experience.

The lie is so vile, that even if it were in speaking well of godly things, it would take off something from God's grace; and Truth is so excellent, that if it praises but small things they become noble.