This is probably one of the most important questions man has ever asked from God. In the Gospel of John, a Pharisee named Nicodemus asked the Lord Jesus Christ about this, and this was His answer: “Except a man be born again, he cannot see the kingdom of God.” The question now is how is a man born again?
Mankind has two types of body – the physical and the spiritual. The physical body is given birth by the mother, while the spiritual body is given birth through the power of the Holy Spirit. How then can the Holy Spirit give birth to an individual? The answer is simple: if he believes that only Jesus can save him, then he would be born again.
Once a man is born again, that is the only way he can enter the kingdom of God one day, whether it is by death, or when Jesus comes again.