Medicine to produce health must examine disease and music, to create harmony must investigate discord.

• The wildest colts make the best horses.
• What we achieve inwardly will change outer reality.
• I don't need a friend who changes when I change and who nods when I nod my shadow does that much better.
• Courage consists not in hazarding without fear but being resolutely minded in a just cause.
• Courage stands halfway between cowardice and rashness, one of which is a lack, the other an excess of courage.
• The very spring and root of honesty and virtue lie in good education.
• Courage consists not in hazarding without fear but being resolutely minded in a just cause.
• I don't need a friend who changes when I change and who nods when I nod my shadow does that much better.
• To make no mistakes is not in the power of man but from their errors and mistakes the wise and good learn wisdom for the future.
• It were better to have no opinion of God at all than such a one as is unworthy of him for the one is only belief - the other contempt.