THE ORIGIN OF COURAGE.--The ordinary man is as courageous and invulnerable as a hero when he does not see the danger, when he has no eyes for it. Reversely, the hero has his one vulnerable spot upon the back, where he has no eyes. 573. THE DANGER IN THE PHYSICIAN.--One must be born for one's physician, otherwise one comes to grief through him. 574. MARVELLOUS VANITY.--Whoever has courageously prophesied the weather three times and has been successful in his hits, acquires a certain amount of inward confidence in his prophetic gift. We give credence to the marvellous and irrational when it flatters our self-esteem. 575. A PROFESSION.--A profession is the backbone of life. 576. THE DANGER OF PERSONAL INFLUENCE.--Whoever feels that he exercises a great inward influence over another person must give him a perfectly free rein, must, in fact, welcome and even induce occasional opposition, otherwise he will inevitably make an enemy. 577. RECOGNITION OF THE HEIR.--Whoever has founded something great in an unselfish spirit is careful to rear heirs for his work. It is the sign of a tyrannical and ignoble nature to see opponents in all possible heirs, and to live in a state of self-defence against them. 578. PARTIAL KNOWLEDGE.--Partial knowledge is more triumphant than complete knowledge; it takes things to be simpler than they are, and so makes its theory more popular and convincing. 579. UNSUITABLE FOR A PARTY-MAN.--Whoever thinks much is unsuitable for a party-man; his thinking leads him too quickly beyond the party. 580. A BAD MEMORY.--The advantage of a bad memory is that one enjoys several times the same good things for the _first_ time. 581. SELF-AFFLICTION.--Want of consideration is often the sign of a discordant inner nature, which craves for stupefaction. 582. MARTYRS.--The disciples of a martyr suffer more than the martyr. 583. ARREARS OF VANITY.--The vanity of many people who have no occasion to be vain is the inveterate habit, still surviving from the time when people had no right to the belief in themselves and only begged it in small sums from others. 584. _PUNCTUM SALIENS_ OF PASSION.--A person falling into a rage or into a violent passion of love reaches a point when the soul is full like a hogshead, but nevertheless a drop of water has still to be added, the good will for the passion (which is also generally called the evil will). This item only is necessary, and then the hogshead overflows. 585.