In Matthew 7, there is a famous passage where Jesus says of certain people: I never knew you.
People have infamously used this to say that it refers to backslidden Christians, but it could never mean that; for that would mean that the words of Jesus are not trustworthy.
He confidently affirms that He will never lose any of His sheep, that none that comes to Him will perish, that He will keep safely and raise on the last day.
I believe I am in His Kingdom now and forever, do you believe it?