Verily I have cleansed my heart in vain - That is, There is no advantage in all my efforts to become pure and holy. It does not assist me in obtaining the favor of God; and it would be just as well to live a sinful life - to indulge in the pleasures of sense - to make the world my portion. Nothing is to be gained by all my painful efforts at self-discipline; by all my endeavors to become righteous. It would have been as well for me - or better - if I had lived a life of sin like other people. The righteous obtain from God fewer blessings than the wicked; they have less happiness and less prosperity in this world; they are subjected to more trouble and sorrow; and to all else there must be added the struggles, the conflict, the warfare, the painful effort “to be” pure, and to lead a holy life, all of which is now seen to be of no advantage whatever. Such thoughts as these were not confined to the psalmist. They are thoughts which will start up in the mind, and which it is not easy to calm down.
And washed my hands in innocency - That is, It has been of no use that I have washed my hands in innocency. The word “innocency” here means “purity.” He had washed his hands in that which was pure; as, pure water. To wash the hands is emblematic of innocence or purity. See the notes at Psalms 26:6.