And He Himself is the propitiation for our sins, and not for ours only but also for the whole world. – 1 John 2:2

In my first coming to Jesus I can have no knowledge of any personal and special interest in the blood of Jesus; but since it is written, “God hath set Him forth to be a propitiation for our sins: and not for ours only, but also for the sins of the whole world,” I come and trust myself to that propitiation; sink or swim I cast myself on the Saviour. Great Son of God, Thou hast lived and died, Thou hast bled and suffered, and made atonement for sin for all such as trust Thee, and I trust Thee, I lean upon Thee, I cast myself upon Thee. Now, whoever has such faith as this is born of God, he has true faith which is proof positive of the new birth. Judge ye, therefore, whether ye have this faith or no.

A remarkable representation of faith was that of the healing look of the serpent-bitten Israelites. On the great standard in the midst of the camp Moses lifted up a serpent of brass; high overhead above all the tents this serpent gleamed in the sun, and whoever of all the dying host would but look to it was made to live. Looking was a very simple act, but it indicated that the person was obedient to God’s command. He looked as he was bidden, and the virtue of healing came from the brazen serpent through a look. Such is faith. It is the simplest thing in the world, but it indicates a great deal more than is seen upon its surface: “There is life for a look at the Crucified One.” To believe in Jesus is but to glance the eye of faith to Him, to trust Him with thy soul. O soul, if thou canst get into contact with Christ by simply trusting Him, though that trust be ever so feeble, thou hast the faith of God’s elect; thou hast the faith which is in every case the token of the new birth. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/0979.cfm