"And if any man sin we have an Advocate with the Father, Jesus Christ, the righteous. And he is the propitiation for our sins; and not for ours only, but also for the sins of the whole world."
He proposes to undertake your cause; and to be a Christian is to at once surrender your whole cause, your whole life and being to Him as your Advocate.
He is an Advocate that loses no causes. Every cause committed to Him, and continued in His hands, is infallibly gained. His advocacy is all-prevalent. God has appointed Him as an Advocate; and wherever He appears in behalf of any sinner who has committed his cause to Him one word of His is sure to prevail. Hence you see,
The safety of believers. Christ is always at His post, ever ready to attend to all the concerns of those who have made Him their Advocate. He is able to save unto the uttermost all that come unto God by Him; and abiding in Him you are forever safe.
~(Charles Finney, SermonIndex.net)