A happy life consists in tranquility of mind.
Cicero
A life of peace, purity, and refinement leads to a calm and untroubled old age.
Cicero
A mind without instruction can no more bear fruit than can a field, however fertile, without cultivation.
Cicero
Advice is judged by results, not by intentions.
Cicero
All action is of the mind and the mirror of the mind is the face, its index the eyes.
Cicero
Art is born of the observation and investigation of nature.
Cicero
Descartes is a close second
Also - Theologians like St. Augustine & Thomas of Aquinas are accepted and encouraged for discussion.