"Would you live with ease, do what you ought, and not what you please." -- Benjamin Franklin

"This too shall pass." -- Benaiah ben Yehoyada's Jeweler

"Never be completely unoccupied, but read or write or pray or meditate or do something for the common good." -- Thomas a Kempis

Here's another version of the same quote with some of the context:

If thou canst not be always examining thyself, thou canst at certain seasons, and at least twice in the day, at evening and at morning. In the morning make thy resolves, and in the evening inquire into thy life, how thou hast sped to-day in word, deed, and thought; for in these ways thou hast often perchance offended God and thy neighbour. Gird up thy lions like a man against the assaults of the devil; bridle thine appetite, and thou wilt soon be able to bridle every inclination of the flesh. Be thou never without something to do; be reading, or writing, or praying, or meditating, or doing something that is useful to the community. Bodily exercises, however, must be undertaken with discretion, nor are they to be used by all alike.

From: Project Gutenberg–>Thomas a Kempis

"Breathing in I calm my body, breathing out I smile." -- Thich Nhat Hanh 

"Mahatma Gandhi has said that to be well adjusted in a wrong situation is very bad; in a wrong situation we should keep on acting to set it right." -- Eknath Easwaran (paraphrasing Mohandas K. Gandhi)

"It is no measure of health to be well adjusted to a profoundly sick society." -- J. Krishnamurti

"This hour in history needs a dedicated circle of transformed nonconformists. Our planet teeters on the brink of atomic annihilation; dangerous passions of pride, hatred, and selfishness are enthroned in our lives; truth lies prostrate on the rugged hills of nameless calvaries; and men do reverence before false gods of nationalism and materialism. The saving of our world from pending doom will come, not through the complacement adjustment of the conforming majority, but through the creative maladjustment of a nonconforming minority." -- Martin Luther King