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 u… - Epictetus

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.

When a man is proud because he can understand and explain the
writings of Chrysippus, say to yourself, if Chrysippus had not written
obscurely, this man would have had nothing to be proud of.

When you find your direction, check to make sure that it is the right one.

What is the first business of one who studies philosophy? To part with self-conceit. For it is impossible for any one to begin to learn what he thinks that he already knows.