He tells us that we must be born again. The change in us needs to be so complete that He must, in fact, start all over again with us. We need to be born for a second time into God's family, external changes are not sufficient. If there is a flicker of desire on your part to enter God's kingdom, you need to receive the Lord Jesus Christ as your Saviour by faith. It means that you act on that knowledge.
Faith is based on facts and evidenced by experience.
Here are the facts of the Gospel succinctly, directly, simply. Your life is characterized by sinful self-centredness. You care most about your own convenience, comfort, pleasure, status, reputation, fulfillment, and so on. Because of this you resort to sinful measures to meet your needs and goals in life. And because of this, you can never be what God wants you to be, because . . .