And he said, “Lord, I believe.” And he worshipped Him. – John 9:38

For with the heart one believes unto righteousness, and with the mouth confession is made unto salvation. – Romans 10:10

True faith always expresses itself to the Lord. This man, when he had believed in Jesus, said, “Lord, I believe.” True faith ought also to express itself to men, as Paul puts it, in writing to the Romans, “For with the heart man believeth unto righteousness; and with the mouth confession is made unto salvation;” or, as the Master Himself puts it, “He that believeth and is baptized shall be saved.” Therefore, the confession before men ought not to be neglected in any case; yet I fear, and hope, that there are some pilgrims who steal into heaven, scarcely known by men to be Christians, at least, not avowed as such by open profession. I do not recommend that dodging behind the hedges and getting to heaven along back roads; that is a bad plan, but, still, I trust some have managed it, though with much trouble and loss to themselves; but, in every case, every one who has believed has made the confession of that faith to the Master Himself. He has said to Jesus, as this man did, “Lord, I believe,” even though he has added, with another man, “Help Thou mine unbelief.” He has said to Jesus, with Thomas, “My Lord and my God.” There has been a personal acknowledgment, as we sometimes sing it:

“My faith looks up to Thee,
Thou Lamb of Calvary,
Savior divine.”

How sweetly doth faith, sometimes, come up from the wilderness, leaning upon her Beloved, and owning to Him that she is His, and He is hers! She cannot help making this confession; she would be untrue to herself and to her Lord if she did not do so. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/2667.cfm