“Of all the tasks which are set before man in life, the education and management of his character is the most important, and, in order that it should be successfully pursued, it is necessary that he should make a calm and careful survey of his own tendencies, unblinded either by the self-deception which conceals errors and magnifies excellences, or by the indiscriminate pessimism which refuses to recognize his powers for good. He must avoid the fatalism which would persuade him that he has no power over his nature, and he must also clearly recognize that this power is not unlimited.”