Let reason govern desire.

Reason is the mistress and queen of all things. [Lat., Domina omnium et regina ratio.]

Reason should direct and appetite obey

He only employs his passion who can make no use of his reason

For there is but one essential justice which cements society, and one law which establishes this justice. This law is right reason, which is the true rule of all commandments and prohibitions. Whoever neglects this law, whether written or unwritten, is necessarily unjust and wicked.

Wise men are instructed by reason; men of less understanding, by experience; the most ignorant, by necessity; the beasts, by nature.