Put the world’s greatest philosopher on a plank that is wider than need be: if there is a precipice below, although his reason may convince him that … - Blaise Pascal

One must know oneself. Even if that does not help in finding truth, at least it helps in running one's life, and nothing is more proper.

Man finds nothing so intolerable as to be in a state of complete rest, without passions, without occupation, without diversion, without effort.

Then he faces his nullity, loneliness, inadequacy, dependence, helplessness, emptiness.

And at once there wells up from the depths of his soul boredom, gloom, depression, chagrin, resentment, despair.

There are only two kinds of men: righteous men who believe themselves sinners; the rest, sinners, who believe themselves righteous - Pascal