Letters 102.29

Such thoughts permit nothing mean to settle in the soul, nothing low, nothing cruel. They maintain that the gods are witnesses of everything. They order us to meet the gods’ approval, to prepare ourselves to join them at some future time, and to plan for immortality. He that has grasped this idea shrinks from no attacking army, is not terrified by the trumpet-blast, and is intimidated by no threats.

Seneca, Letters to Lucilius 102.29, translated by Richard Mott Gummere