And this is the Father’s will which hath sent Me, that of all which He hath given Me I should lose nothing, but should raise it up again at the last day. – John 6:39

(I)f a man never in his life knew himself to be a Christian, he never was a Christian. If he never had a moment of confidence, when he could say, “Now I know in whom I have believed,” I think I do not utter a harsh thing when I say, that that man could not have been born again; for I do not understand how a man can be killed and then made alive again, and not know it; how a man can pass from death unto life, and not know it; how a man can be brought out of darkness into marvellous liberty without knowing it. I am sure I know it when I shout out my old verse,

“Now free from sin, I walk at large,
My Saviour’s blood’s my full discharge;
At His dear feet content I lay,
A sinner saved, and homage pay.”

There are moments when the eyes glisten with joy and we can say, “We are persuaded, confident, certain.” I do not wish to distress any one who is under doubt. Often gloomy doubts will prevail; there are seasons when you fear you have not been called, when you doubt your interest in Christ. Ah! what a mercy it is that it is not your hold of Christ that saves you, but His hold of you! What a sweet fact that it is not how you grasp His hand, but His grasp of yours, that saves you. ~ C.H. Spurgeon

http://www.blueletterbible.org/Comm/spurgeon_charles/sermons/0007.cfm