What does John 6:37 mean?
The crowds who followed Jesus because of His healing miracles (John 6:2) saw Him perform a supernatural act the prior day (John 6:9–14). In this passage, Jesus has been trying to explain that His ministry is inherently spiritual, not material. The people are fixated on the idea of material things. In the same way, they are stuck on the idea of working for their own salvation. Instead, Jesus points to the one and only means of salvation: belief in the One whom God has sent into the world (John 6:29). Jesus has already pointed to Himself as this "Bread of Life" (John 6:35), which the people won't recognize even though they've seen more than enough evidence.This verse continues to explain the idea of eternal life, touching on at least two controversial doctrines. The first is that of predestination: implied by Jesus' phrase "all that the Father gives me will come to me." This suggests that those who accept Jesus' teaching that He is the Bread of Life—those who obtain eternal life—are identical to those who are "given" to Him by God the Father. Logically, this implies that those who do not come to Christ have not been "given" to Him.
Various theories exist on what exactly this means. Some interpret this as a hard determination by God. Others see this as a reference to God's sovereign choice in the issue of salvation. This might imply that God works to bring people to saving faith, but not necessarily that He withholds it from those who are not saved. No matter what view one takes, this verse creates a border for interpretation. God's sovereign involvement in souls coming to Christ for salvation is beyond debate. Those who are saved are those whom the Father "has given" to Christ, whatever that is interpreted to mean.
The second doctrine involved in this verse is that of eternal security. This is the idea that those who are truly saved in Christ can never lose that salvation. Compared to the shadowy edges of predestination, the Bible is extremely specific on this point. In and of itself, this verse speaks only to Christ's unconditional acceptance of anyone who "comes to [Him]." All by themselves, these words only indicate that those who place their faith in Christ (John 6:35) will unquestionably be saved.
However, Jesus will later speak of these same people as those who will unfailingly be raised "on the last day" (John 6:40, 44, 54). This makes John 6:37 a useful support for the doctrine of eternal security, but only in the context of the verses which follow.