Know thyself,’ said Socrates. Know thyself,’ said Sappho, ‘and make sure that the Church never finds out.

Know thyself, and thou shalt know God.

To know thyself is the beginning of wisdom.

The height of all philosophy is to know thyself; and the end of this knowledge is to know God.

One of the perks of being a psychologist is access to tools that allow you to carry out the injunction to know thyself.

To "know thyself" must mean to know the malignancy of one's own instincts and to know, as well, one's power to deflect it.

A caterpillar who seeks to know himself would never become a butterfly

Now thyself is more important than “Know thyself.

Many become popular because they speak and write with a reductionist style that brings the complex and disturbing down into canned formulas of what spiritual growth is supposedly all about. Dozens of such New Age authors could bring their works together into one large volume entitled, “How To Become Aware of the Depths of Your Being Without Disturbing the Routine of Your Comfortable Lifestyle.

...there were none so scornful as those who had had to learn the hard way.