I have this tattooed on my left side! I love the saying and it's a perfect description of Karma, don't judge/discriminate and don't do to someone what you wouldn't want done to you.

Virtue is a kind of health, beauty and good habit of the soul.

Let no-one ignorant of geometry enter. Said to have been inscribed above the door of Plato's Academy.

Truth is its own reward.

To conquer oneself is the best and noblest victory; to be vanquished by one's own nature is the worst and most ignoble defeat.

The true lover of knowledge naturally strives for truth, and is not content with common opinion, but soars with undimmed and unwearied passion till he grasps the essential nature of things.

...in every man there is an eye of the soul, which...is more precious far than ten thousand bodily eyes, for by it alone is truth seen.