Eternal Security 20 - John 6:35

John 6:35 KJV  And Jesus said unto them, I am the bread of life: he that cometh to me shall never hunger; and he that believeth on me shall never thirst.

"Cometh" is either done and finished, or it hasn't happened. "Coming" can be progressive and partial, but once you've finished then it's done.

Once you've come to Jesus (ie trusted Him, given yourself to Him), you're saved for eternity. You can never hunger and never thirst again. You cannot lose your salvation or walk away. He will keep you forever.