Human behavior, says Plato, flows from three main sources: desire, emotion, and knowledge. - Will Durant

A nation is born stoic, and dies epicurean. At its cradle (to repeat a thoughtful adage) religion stands, and philosophy accompanies it to the grave.
In the beginning of all cultures a strong religious faith conceals and softens the nature of things, and gives men courage to bear pain and hardship patiently; at every step the gods are with them, and will not let them perish, until they do. Even then a firm faith will explain that it was the sins of the people that turned their gods to an avenging wrath; evil does not destroy faith, but strengthens it. If victory comes, if war is forgotten in security and peace, then wealth grows; the life of the body gives way, in the dominant classes, to the life of the senses and the mind; toil and suffering are replaced by pleasure and ease; science weakens faith even while thought and comfort weaken virility and fortitude. At last men begin to doubt the gods; they mourn the tragedy of knowledge, and seek refuge in every passing delight.
Achilles is at the beginning, Epicurus at the end. After David comes Job, and after Job, Ecclesiastes.

This is the tragedy of almost every civilization — that its soul is in its faith, and seldom survives philosophy.

"It is a mistake to think that the past is dead. Nothing that has ever happened is quite without influence at this moment. The present is merely the past rolled up and concentrated in this second of time.As quoted in "The Gentle Philosopher" Will Durant"