Charles H. Spurgeon on Psalms 35:9

"And my soul shall be joyful in the Lord." Thus rescued, David ascribes all the honour to the Judge of the right; to his own valorous arm he offers no sacrifice of boasting. He turns away from his adversaries to his God, and finds a deep unbroken joy in Jehovah, and in that joy his spirit revels. "It shall rejoice in his salvation." We do not triumph in the destruction of others, but in the salvation given to us of God. Prayer heard should always suggest praise. It were well if we were more demonstrative in our holy rejoicings. We rob God by suppressing grateful emotions.