Dimitri

“When therefore we are hindered, or disturbed, or grieved, let us never attribute it to others, but to ourselves; that is, to our own principles. An uninstructed person will lay the fault of his own bad condition upon others. Someone just starting instruction will lay the fault on himself. Some who is perfectly instructed will place blame neither on others nor on himself.”
― Epictetus, The Enchiridion

“This above all: to thine own self be true,
And it must follow, as the night the day,
Thou canst not then be false to any man.”
― William Shakespeare, Hamlet

“26. The will of nature may be learned from those things in which we don’t distinguish from each other. For example, when our neighbor’s boy breaks a cup, or the like, we are presently ready to say, “These things will happen.” Be assured, then, that when your own cup likewise is broken, you ought to be affected just as when another’s cup was broken. Apply this in like manner to greater things. Is the child or wife of another dead? There is no one who would not say, “This is a human accident.” but if anyone’s own child happens to die, it is presently, “Alas I how wretched am I!” But it should be remembered how we are affected in hearing the same thing concerning others.”
― Epictetus, The Enchiridion

“28. If a person gave your body to any stranger he met on his way, you would certainly be angry. And do you feel no shame in handing over your own mind to be confused and mystified by anyone who happens to verbally attack you?”
― Epictetus, The Enchiridion