Knowledge slowly builds up what Ignorance in an hour pulls down.

It is folly for an eminent man to think of escaping censure, and a weakness to be affected with it. All the illustrious persons of antiquity, and indeed of every age in the world, have passed through this fiery persecution.

Reason is a crutch for age, but youth is strong enough to walk alone.

What Youth deemed crystal, Age finds out was dew.

Just as we reject racism, sexism, ageism, and heterosexism, we reject speciesism. The species of a sentient being is no more reason to deny the protection of this basic right than race, sex, age, or sexual orientation is a reason to deny membership in the human moral community to other humans.