Perfect happiness is not to be looked for in this world.

If it could be secured, it would be found profitless.

The hollowest of all gospels is the gospel of ease and comfort.

Difficulty, and even failure, are far better teachers.

Sir Humphry Davy said: "Even in private life, too much prosperity either injures the moral man, and occasions conduct which ends in suffering; or it is accompanied by the workings of envy, calumny, and malevolence of others." Failure improves tempers and strengthens the nature.