Charles H. Spurgeon on Psalms 119:154

Plead my cause, and deliver me, etc. Albeit the godly under persecution have a good cause, yet they cannot plead it except God the Redeemer show himself as Advocate for them; therefore prayeth the Psalmist, "Plead my cause."

When God the Redeemer pleadeth a man's cause, he doth it to purpose and effectually: "Plead my cause, and deliver me."

Except the Lord's clients shall find new influence from God from time to time in their troubles, they are but as dead men in their exercise; for, "Quicken me" imports this.

Till we find lively encouragement given to us in trouble we must adhere to the word of promise: "Quicken me according to thy word."

What the believer hath need of, that God hath not only a will to supply, but also an office to attend it, and power to effectuate it, as here he hath the office of an Advocate and of a powerful Redeemer also, wherein the believer may confidently give him daily employment, as he needeth: "Plead my cause, and deliver me: quicken me according to thy word." David Dickson.