James Durham, in his 59th sermon on Isaiah 53 says this:
These three are the great warrant that a sinner has to roll himself over on; a complete Mediator; a faithful God promising to answer all grounds of fears, doubts and jealousies; and free grace, which answers all challenges that may come in to hinder his closing with, and resting on the promise. For if it should be said, ‘How dare you lay hold upon the promises?’ The answer is, ‘It is free.’ It is not the mount that may not be touched, but it is Jesus the Mediator of the new covenant, etc. It is grace that is the rise, the end, and the condition of it. These are the three on which faith yields itself to Christ, and which are the object of it, on which it dare hazard, and on which it does hazard; and these three are revealed in the gospel of the grace of him that is faithful, and cannot deny himself.
May we not then say, ‘O sinners, if you will believe that, you have a good resting place,’ a sure Foundation, a tried Cornerstone, as it is Isa. 28:16 cited Rom. 9:33, where the apostle has it, He that believes on him shall never be ashamed. There is a sufficient surety, a full Mediator, there is a faithful God that will keep his word, and there is a free covenant and promise, softer a bruised soul to roll itself over upon, than any bed of the finest downs is for a weary and crazy body. This is a chariot paved with love for the daughters of Jerusalem.
Single out Christ from all that is in the word, without slighting any part of it, and believe in him and lippen to him; let him have another weight and lift of you than you give to any other thing; he is able to bear it, and God will never quarrel you for so doing, but will keep his word to you that do betake yourselves, or that have betaken yourselves to him. He that believes shall never perish, nor come into condemnation. O! know what a ground you have to rest upon; it is even the substance and marrow of all the Word of God. You have Christ and his fullness, God and his faithfulness, grace and its freeness. And are there such three things beside? Or is it imaginable or possible that there can be any beguile, or failure here? Spare not then to lay the weight of your souls upon it. Let it be the foundation of your peace, and let it answer all challenges that may be, whether for many, or for great and grievously aggravated sins. Only by faith take hold of this righteousness, and rest upon God’s faithfulness, and free promise to make it forthcoming to you. But upon the other side, O how great will it aggrege your guilt, that had such a remedy in your offer, such a tried cornerstone, elect and precious, to rest upon, and yet made no use of it! Let me exhort, beseech, and even obtest you, That ye receive not this grace in vain. But as Christ is laid for a sure Foundation, so come to him, and build upon him, that you may not be ashamed in the day of the Lord, when all the believe not, how presumptuously so ever they may hold up their heads now, shall be ashamed and confounded, world without end. O happy, thrice happy will they all be found to be then, who have trusted in him.