Charles H. Spurgeon on Psalms 119:154

Plead my cause. The children of this world are wiser in their generation than the children of God. Which made David here pray to God that he would plead his cause, and be his Advocate against all their lies. He trusted not to the equity of his own cause, but to the Lord. From whence we gather, that the cause why our oppressors prevail oft against us is, because we trust too much in our own wits, and lean too much upon our own inventions; opposing subtilty to subtilty, one evil device to another, matching and maintaining policy by policy, and not committing our cause to God. Abraham Wright.