I would encourage you, as always to read the entire commmentary, but will include a short clip:
The only religious knowing and believing which can save concern the Person of the Lord Jesus Christ. “I know,” saith the apostle, — not “what “ — but “whom I have believed.” He does not say, “I know the catechism which I have believed,” nor “I know the Institutes of Calvin,” nor “I know the body and system of theology”; but, “I know whom I have believed.” Both the knowing and the believing centre round the wondrous person who for our sakes left his starry throne and became a man; knowing whom, is a saving knowledge, and trusting whom, is saving trust, but of which, all other knowing and believing falls short.
Observe, then, that all other knowledge may be useful enough in itself, but if it doth not concern Christ, it cannot be called saving knowledge. Same person know a great deal about doctrine. Perhaps they have taken up with the Calvinistic theology, or even with the hyper-Calvinistic, and they really understand the system thoroughly well; and they certainly hold it with quite enough tenacity, if not too much. We know some, who we believe, would very cheerfully go to the stake in defence of some points of doctrine so convinced are they of the orthodoxy of what they have received. Others take up another theory, and go upon, the Arminian principle, and they, too, know their set of doctrines, and know then well. But, dear friends, I may know all the doctrines in the Bible, but unless I know Christ, there, is not one of them that can save me. I may know election, but if I cannot see myself as chosen in Christ Jesus, election will do me no good. I may know the doctrine of the final perseverance of the saints, but if I am not in Christ, I should only persevere in my sins, and such a final perseverance will be dreadful indeed. It is one thing to know the doctrine of justification by faith, but it is quite another thing to be justified by faith, and to have peace with God. You may stand up for imputed righteousness, and fight for it, and yet the righteousness of Christ may never to imputed unto you. It is not knowing the creed, though that is well, that can save the soul; the knowledge that is wanted is to know him whom Paul believed.~