_Goldoni._ 50. Sorrows are like thunder-clouds: in the distance they look black, over our heads, hardly gray. _Richter._ 51. The gem cannot be polished without friction, nor man perfected without trials. _Chinese._ 52. Health is the greatest gift, contentedness the best riches. _Dhammapada._ 53. Great and unexpected successes are often the cause of foolish rushing into acts of extravagance. _Demosthenes._ 54. Let none with scorn a suppliant meet, Or from the door untended spurn A dog; an outcast kindly treat; And so thou shalt be blest in turn. _Mahābhārata._ 55. Choose knowledge, if thou desirest a blessing from the Universal Provider; for the ignorant man cannot raise himself above the earth, and it is by knowledge that thou must render thy soul praiseworthy. _Firdausī._ 56. Good fortune is a benefit to the wise, but a curse to the foolish. _Chinese._ 57. In this thing one man is superior to another, that he is better able to bear adversity and prosperity. _Philemon._ 58. The rays of happiness, like those of light, are colourless when unbroken. _Longfellow._ 59. There are three things which, in great quantity, are bad, and, in little, very good: leaven, salt, and liberality. _Talmud._ 60. Who aims at excellence will be above mediocrity; who aims at mediocrity will be far short of it. _Burmese._ 61. Keep thy heart afar from sorrow, and be not anxious about the trouble which is not yet come. _Firdausī._ 62. If thy garments be clean and thy heart be foul, thou needest no key to the door of hell. _Sa’dī._ 63. We ought never to mock the wretched, for who can be sure of being always happy? _La Fontaine._ 64. To those who err in judgment, not in will, anger is gentle. _Sophocles._ 65. Not only is the old man twice a child, but also the man who is drunk. _Plato._ 66. Wrapt up in error is the human mind, And human bliss is ever insecure; Know we what fortune yet remains behind? Know we how long the present shall endure? _Pindar._ 67.