Fear not, thou worm Jacob, and ye men of Israel; I will help thee, saith the LORD, and thy Redeemer, the Holy One of Israel. – Isaiah 41:14

“In the mouth of two or three witnesses surely the whole shall be established.”

“Blind unbelief is sure to err.”

Now begin. “I will help thee;” lay a stress on that word. If you read it so, there is one blow at your unbelief. “I will help thee,” saith the Redeemer. “Others may not, but I have loved thee with an everlasting love, and by the bands of My lovingkindness have I drawn thee. ‘I will help thee, though the earth forsake thee; though thy father and thy mother forsake thee, I will take thee up. Wilt thou doubt Me? I have proved My love to thee. Behold this gash, this spear thrust in my side. Look hither at My hands: wilt thou but believe Me? ‘ ‘Tis I.’ I said that on the waters, and I said to My people, ‘Be not afraid; it is I.’ I say to thee, now thou art on the waters, ‘ Be not afraid; I will help thee.’ Sure thou needst not fear that I shall ever forget thee. ‘Can a woman forget her sucking child, that she should not have compassion on the son of her womb? Yea, they may forget, yet will I not forget thee.’ ‘I have graven thee on My hands; thy walls are ever before Me.’ ‘I will help thee.'” ” O my Lord, I have ungratefully doubted Thy promise many a time; but methinks, if I could see thee in all Thy woe and sorrow for me, if I could hear Thee say, “I will help thee,” I should cast myself at Thy feet, and say, “Lord, I believe, help mine unbelief.” But though He is not here to speak it, though the lips that utter it are but the lips of man, remember that He speaks through His word, as truly as if He spoke Himself…  “Why art thou cast down, O my soul? Why art thou disquieted within me? Hope thou in God; for I shall yet praise Him; for the Redeemer says, I will help thee,” and if He saith “I will help thee,” who can doubt Him? Who dare distrust Him?~ C.H.Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/0157.cfm