Jn 14:29, Isa 46:9-10

Only God can tell what will happen. (Isa 46:9-10)

Isa 46:9 Remember the former things of old: for I am God, and there is none else; I am God, and there is none like me, 10 Declaring the end from the beginning, and from ancient times the things that are not yet done, saying, My counsel shall stand, and I will do all my pleasure:

Jesus foretold that one of his disciples would betray Him. Jesus foretold what was to come, so that His disciples might believe that He was the Christ. (Jn 13:18-19,21, Jn 14:29)

Jn 13:18 I speak not of you all: I know whom I have chosen: but that the scripture may be fulfilled, He that eateth bread with me hath lifted up his heel against me. 19 Now I tell you before it come, that, when it is come to pass, ye may believe that I am he. 21 When Jesus had thus said, he was troubled in spirit, and testified, and said, Verily, verily, I say unto you, that one of you shall betray me.

Jn 14:29 And now I have told you before it come to pass, that, when it is come to pass, ye might believe.