Failure to read what is happening in another's soul is not easily seen as a cause of unhappiness: but those who fail to attend the motions of their own soul are necessarily unhappy.

Be like the cliff against which the waves continually break; but it stands firm and tames the fury of the water around it.

Things can never touch the soul, but stand inert outside it, so that disquiet can arise only from fancies within.

Turn thy thoughts now to the consideration of thy life, thy life as a child, as a youth, thy manhood, thy old age, for in these also every change was a death. Is this anything to fear?

Within ten days thou wilt seem a god to those to whom thou art now a beast and an ape, if thou wilt return to thy principles and the worship of reason.

If it's time for you to go, leave willingly - as you would to accomplish anything that can be done with grace and honor.

We are born for synergy, just like the feet, just like the hands, just like the eyes, just like the rows of upper and lower teeth. Working against each other is unnatural, and being annoyed and turning one's back is counterproductive.