Maimonides

If men possessed wisdom, which stands in the same relation to the form of man as the sight to the eye, they would not cause any injury to themselves or to others; for the knowledge of truth removes hatred and quarrels, and prevents mutual injuries.

There are eight rungs in charity. The highest is when you help a man to help himself.

God who preceded all existence is a refuge.

When man possesses a good, sound body that does not overpower him nor disturb the equilibrium in him, he possesses a divine gift. In short, a good constitution facilitates the rule of the soul over the body, but it is not impossible to conquer a bad constitution by training.

If the whole earth is infinitely small in comparison with the sphere of the stars, what is man compared with all these created beings!

One should see the world, and see himself as a scale with an equal balance of good and evil. When he does one good deed the scale is tipped to the good - he and the world is saved. When he does one evil deed the scale is tipped to the bad - he and the world is destroyed.

Further, there are things of which the mind understands one part, but remains ignorant of the other; and when man is able to comprehend certain things, it does not follow that he must be able to comprehend everything.

Be convinced that, if man were able to reach the end without preparatory studies, such studies would not be preparatory but tiresome and utterly superfluous.

He, however, who begins with Metaphysics, will not only become confused in matters of religion, but will fall into complete infidelity.

Everyone entrusted with a mission is an angel.

Do not consider it proof just because it is written in books, for a liar who will deceive with his tongue will not hesitate to do the same with his pen.

For every force charged by God, may He be exalted, with some business is an angel put in charge.

Commune with your own heart upon your bed, and be still.

How individuals of the same species surpass each other in these sensations and in other bodily faculties is universally known, but there is a limit to them, and their power cannot extend to every distance or to every degree.

If a person studies too much and exhausts his reflective powers, he will be confused, and will not be able to apprehend even that which had been within the power of his apprehension. For the powers of the body are all alike in this respect.

You will certainly not doubt the necessity of studying astronomy and physics, if you are desirous of comprehending the relation between the world and Providence as it is in reality, and not according to imagination.

The whole object of the Prophets and the Sages was to declare that a limit is set to human reason where it must halt.

You must accept the truth from whatever source it comes.

In the realm of Nature there is nothing purposeless, trivial, or unnecessary

Man's shortcomings and sins are all due to substance of the body and not to its form, while all his merits are exclusively due to his form.

However great the exertion of our mind may be to comprehend the Divine Being or any of the ideals, we find a screen and partition between Him and ourselves. Thus the prophets frequently hint at the existence of a partition between God and us.