John 6:65

Again Jesus expressed His belief that the human decision to believe or not believe rested ultimately in God’s elective purpose (John 6:37; John 6:44). Thus He did not view the unbelief of His disciples as an indication that He had failed. Notwithstanding, He did not present the importance of belief on Himself as something His hearers could take or leave either. It meant the difference between life and death to them, and He urged them to believe.