"Wisdom allows nothing to be good that will not be so forever; no man to be happy but he that needs no other happiness than what he has within himself; no man to be great or powerful that is not master of himself."

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Who is so wise as to have a perfect knowledge of all things? Therefore trust not too much to thine own opinion, but be ready also to hear the opinion of others. Thought thine own opinion be good, yet if for the love of God thou foregoest it, and followest that of another, thou shalt the more profit thereby.

— Thomas a Kempis