Beloved, now we are children of God, and it has not appeared as yet what we will be. We know that when He appears, we will be like Him, because we will see Him just as He is. -1 John 3:2

I have known unbelief arise in some souls through a most proper reverence for Christ, and a high esteem for all that belongs to Him...You remember…John, who when he saw his Master in all His glory fell at His feet as dead. Ah, when the soul gets near to Jesus it perceives His perfection, and becomes conscious of its own imperfection; it sees His glory, and becomes aware of its own nothingness; it sees His love, and blushes at its own unloveliness; and then it is very, very apt to be tortured with mistrust, though it ought not so to be.

And I have even known when children of God just converted have come into the church, they have had such a high esteem for their brethren and sisters, that they have feared to be numbered with them. When they have heard some earnest brother pray they have said, “Oh, what a prayer, I shall never be like that man;” and, perhaps, they have listened to the preachings of some servant of God and said, “Ah, I cannot come up to that standard; the very existence of such a man as that condemns me.” It is beautiful to see the little children loving the elder sons of the family, and admiring what they see of the Father in them; but even this holy modesty may be turned into unbelief, though it ought not so to be; for, O child of God, if Christ be so lovely, thou art on the way to be made like Him; and if there be anything beautiful in any of His people, that same shall be given unto thee, for they also are as thou art, men of like passions with thyself; and God who has done great things for them will do the like for thee, for He loves thee with the self-same love.~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/1033.cfm