The only successful attempt to free human reason from the authority of religion was that of Spinoza (1632–1677). In his Theologico-Political Treatise… - Benedictus de Spinoza

Nothing is less Greek than the conceptual web-spinning of a hermit—amor intellectualis dei—after the fashion of Spinoza.

I believe there is another reason also why Spinoza seems to me so pre-eminent: that in spite of being traditional, or because he was not distracted by side issues, he was an entire and majestic mind, a singularly consecrated soul. All these trite dogmas and problems lived in him and were the natural channels for his intuitions and emotions. That is what I feel to make a real philosopher and not, what we are condemned to be, professors of the philosophy of other people, or of our own opinions.

I would not claim that Spinoza is the only philosopher who can help maintain equilibrium, but whenever I have been in a difficult situation, professional or personal, it has been Spinoza's emphasis on our ability to reason in everyday life that has come to my rescue. We must understand the possibility, even the necessity of negative aspects of our lives, such as depression, lack of energy or unhappiness. Reason can show us the difference between what is temporary, and what is permanent.