James Durham, Christ Crucified: The Marrow of the Gospel in 72 Sermons on Isaiah 53, speaking of that phrase in Isaiah 53:11, He shall see of the travail of his soul, and shall be satisfied has this to say:
There is here a sweet word of consolation to poor souls, that fain would have sin taken away and are afraid to presume. Our Lord will never be angry, that you make use of his sufferings for your own good; nay, he accounts it a satisfaction to him, that you improve them; that, when you find yourselves arrested for sin, you put it on his score, and draw a bill on him to pay your debt; that, when you find yourselves under them, which, to you, looks like the dominion of sin, you look to his cross for virtue to crucify, kill and subdue it. If therefore (as I have often said), you would do him a favor or pleasure, make use of him. Be assured, that the more weight you lay on him, you do him the greater pleasure; and this is all the amends that he seeks for all the wrongs you have done to him, and all the satisfaction that he seeks for all the good turns he has done to you, that you come to him, thus to make use of him. And it is good reason, even all the reason in the world, that he get this amends made to him, and this satisfaction granted to him.
The return we make to Christ for his work on our behalf, is to make use of it. It is not presumption, as the weak in conscience sometimes think, to stake a claim to the advocacy of Christ: on the contrary, refusal to use him is the ultimate insult to his grace. Would you please Christ? Then trust him alone for all your salvation and take each qualm of conscience and pang of guilt about your sin to him to deal with.