Much Righteousness & Much Wickedness

Ecclesiastes 7:15-18

15  All things have I seen in the days of my vanity: there is a just man that perisheth in his righteousness, and there is a wicked man that prolongeth his life in his wickedness. 
16  Be not righteous over much; neither make thyself over wise: why shouldest thou destroy thyself? 
17  Be not over much wicked, neither be thou foolish: why shouldest thou die before thy time? 
18  It is good that thou shouldest take hold of this; yea, also from this withdraw not thine hand: for he that feareth God shall come forth of them all.