Proverbs 15:6 In the house of the righteous is much treasure: but in the revenues of the wicked is trouble. 

‘Revenues’ [Hebrew: tebuw’ah] increase (15:6; 8:19; 16:8; Isa. 23:3; Jer. 12:13). The gain of the wicked is through crime and trouble. Psalms 94:11 states that the Lord knows the thoughts of the wise, that they are vain (1Cor. 3:20). Quoted from. The wise of the world are always full of schemes and plans for earthly gain, all empty and futile. Religion cannot be used for personal gain (Mark 7:11-12), but false preachers will always propagate those parts of religion from which they receive the most personal gain and honour (Matt. 23:16-22).

The Christian must not gain the world at the expense of his soul (Matt. 16:26). He must serve readily, not for personal gain (Tit. 1:7; 1Pet. 5:2) and not use wrong methods to raise money to increase his income (1Tim. 3:3, 8; Tit. 1:7). Put your life into service for God whether or not you receive personal gain and applause (Rom. 12:11).