Jesus Himself! Nothing less is offered to us. If we want Him, we can have Him. All that He is, and all that He has, may be ours. Our Christianity, to be all that it ought to be and may be, must be just this-Himself.
The true and perfect knowledge of Him really settles every difficulty. To know Him is to know God, and to know God is to end our doubts. Christ had none, because this knowledge was His; and it may be ours.