8. Be CONTENTED with the station and circumstances in which Providence has placed you.Never repine at God’s dealings towards you, nor envy those who are above you in worldly advantages. Consider not so much what you lack, as what you have; and look less at those above you, than at those in inferior circumstances. Accustom yourselves to look on the bright side, rather than the dark side of the picture. Indulge not in unreasonable fears, nor give way to feelings of despondency. Exercise fortitude and maintain tranquility of mind. Be not ruffled and disconcerted by every little cross event which may occur. Place not your happiness at the disposal of everyone who may be disposed to speak an unkind word, or to do an unkind thing. Learn to possess your souls in patience, believing that when appearances are darkest, the dawn of a more comfortable day is near.
– Archibald Alexander; Counsels of the Aged to the Young (See here for more info)