Then Jesus reveals His death on the cross, that
many who didn't believe Him during His lifetime
would believe because of His death.

"Then said Jesus unto them, When ye have lifted
up the Son of man, then shall ye know that I am
he, and that I do nothing of myself; but as my
Father hath taught me, I speak these things.
And he that sent me is with me: the Father hath
not left me alone; for I do always those things
that please him.
As he spake these words, many believed on him."
John 8:28-29