They must often change, who would be constant in happiness or wisdom. — Confucius

Man needs, for his happiness, not only the enjoyment of this or that, but hope and enterprise and change. — Bertrand Russell
Love is the joy of the good, the wonder of the wise, the amazement of the Gods. — Plato
No matter how dull, or how mean, or how wise a man is, he feels that happiness is his indisputable right. — Helen Keller
Wisdom, compassion, and courage are the three universally recognized moral qualities of men. — Confucius
The more man meditates upon good thoughts, the better will be his world and the world at large. — Confucius
The expectations of life depend upon diligence; the mechanic that would perfect his work must first sharpen his tools. — Confucius