Galatians 5:8

And we know that for those who love God all things work together for good, for those who are called according to His purpose.

and those whom He predestined, He also called; and those whom He called, He also justified; and those whom He justified, He also glorified.

I marvel that you are so quickly deserting Him who called you by the grace of Christ for a different gospel,

The one who believes in the Son of God has this witness in himself. The one who does not believe God has made Him a liar, because he has not believed in the witness which God has borne witness about His Son.