How do we know Jesus is the heavenly seed?

In John 12:24, Jesus uses the analogy of a corn of wheat to illustrate His role as the heavenly seed. He states, 'Except a corn of wheat fall into the ground and die, it abideth alone; but if it die, it bringeth forth much fruit.' This means that for salvation to be possible, He has to die and be buried, enabling a harvest of believers through His resurrection. This notion is further supported by Paul's writings, where he emphasizes that through Christ, many will be made alive (1 Corinthians 15). Hence, Christ is the source of spiritual life and fruitfulness.