This is an excerpt from the final chapter of Mortification of Sin by John Owen. This seems to me an honest and excellent prayer that seeks relief from sin from Christ.
Christ tells us that we obtain purging grace by abiding in him, John 15:3. To act faith upon the fullness that is in Christ for our supply is an eminent way of abiding in Christ, for our insition and abode is by faith, Rom. 11:19-20.
Let, then, thy soul by faith be exercised with such thoughts and apprehensions as these:
"I am a poor, weak creature; unstable as water, I cannot excel. This corruption is too hard for me, and is at the very door of ruining my soul; and what to do I know not.
My soul is become as parched ground, and an habitation of dragons. I have made promises broken them; vows and engagements have been as a thing of nought.
Many persuasions have I had that I had got victory and should be delivered, but I am deceived; so that I plainly see, that without some eminent succor and assistance, I am lost, and shall be prevailed on to an utter relinquishment of God.
But yet, though this be my state and condition, let the hands that hang down be lifted up, and the feeble knees be strengthened. Behold, the Lord Christ, that hath all the fullness of grace in his heart, all fullness of power in his hand, he is able to slay all these his enemies.
There is sufficient provision in him for my relief and assistance. He can take my drooping, dying soul and make me more than a conqueror.
Why sayest thou, O my soul, My way is hid form the Lord, and my judgement is passed over from my God? Hast thou not known, hast thou not heard, that the everlasting God, the Lord, the Creator of the ends of the earth, fainteth not, neither is he weary? there is no searching of his understanding.
He giveth power to the faint; and to them that have no might he increaseth strength; they shall mount up with wings as eagles; they shall run, and not be weary; they shall walk and not faint, Isa. 40:27-31.
He can make the dry, parched ground of my soul to become a pool, and my thirsty, barren heart as springs of water; yea, he can make this habitation of dragons, this heart so full of abominable lusts and fiery temptations, to be a place of grass and fruit to himself, Isa. 35:7.