The adjective is the enemy of the noun. Variant: The adjective is the enemy of the substantive.

A physician is one who pours drugs of which he knows little into a body of which he knows less.

If you wish to obtain a great name or to found an establishment, be completely mad; but be sure that your madness corresponds with the turn and temper of your age.

Superstition is to religion what astrology is to astronomy the mad daughter of a wise mother. These daughters have too long dominated the earth.

What is madness? To have erroneous perceptions and to reason correctly from them.

Fanaticism is a monster that pretends to be the child of religion

Slavery is also as ancient as war, and war as human nature.