Sin is the impassable barrier between God and men, which must be removed and forgiven before reconciliation. Repentance is not enough. There must also be faith. Here is why, what faith must be in, and why alternatives are disastrous.
This is Christ’s own evangelistic message to Nicodemus, using the symbol of the bronze serpent once lifted up for all healing of dying Israelites. It shows the elements of faith, and why it is the only way to obtain forgiveness, new life and blessing from God.