Maimonides

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.

In my office in Jerusalem, there's an ancient seal. It's a signet ring of a Jewish official from the time of the Bible. The seal was found right next to the Western Wall, and it dates back 2,700 years, to the time of King Hezekiah. Now, there's a name of the Jewish official inscribed on the ring in Hebrew. His name was Netanyahu.

The orthodox believers in God are divided into two camps, one of which maintains that the existence of God is as demonstrable as any mathematical proposition, while the other asserts that his existence is not demonstrable to the intellect.