Man's life depends on what he concentrates upon. If he concentrates upon misery he cannot but be miserable. If he has a certain habit or a certain nature of which he does not approve, he thinks he is helpless before it because it is his nature, his own. Nothing is man's nature, except that which he makes for himself As the whole of nature is made by God, so the nature of each individual is made by himself. As the Almighty has the power to change His nature, so the individual is capable of changing his nature-if only he knew how. Among all the creatures of this world man is most entitled to be optimistic, for man represents the nature of God on earth: God as judge, as Creator and as the Master of all His creation. So is man master of his own life, master of his affairs, if only he knew it.