"Now for my own case, I bless the Lord that, for all that hath been said of me, my conscience doth not condemn me. I do not say I am free of sin, but I am at peace with God through a slain Mediator; and I believe that there is no salvation but only in Christ"

Donald Cargill's quote talks to the power of faith in Jesus Christ. He acknowledges that he is not without sin, but he is at peace with God through Jesus' sacrifice. He believes that salvation can just be discovered in Christ, and his conscience does not condemn him. This is an effective declaration of faith and guarantee in the power of Jesus' death and resurrection. It is a tip that, even in the middle of our own struggles with sin, we can find peace and guarantee in the knowledge that Jesus has already paid the cost for our sins. Cargill's quote is a suggestion that, no matter what we have actually done, we can find forgiveness and peace in Jesus Christ.