For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life. (John 3:16 KJV)
Believeth: Greek – to have faith (in, upon, or with respect to, a person or thing), that is, credit; by implication to entrust (especially one’s spiritual well being to Christ): – believe (-r), commit (to trust), put in trust with.
Whosoever believeth in, have faith in, commit to trust and put in trust with Jesus should not perish, but have everlasting life. (“Should Not” in the Greek – expresses an absolute denial. It’s up to us to receive Jesus or to deny Him. We came to the decision when we received Jesus, to accept Him or deny Him) The Amplified bible says, whoever believes in (trusts in, clings to, relies on) Him shall not perish (come to destruction, be lost) but have eternal (everlasting) life. (See John 3:16 The Amplified version)
As we see here, believing is having faith in, having trust in and committing to. As we commit ourselves to Jesus by receiving Him into our heart and making Him Lord of our life we receive a life change, we receive eternal life. We have been made the righteousness of God in Him. (2 Corinthians 5:21)
Be Encouraged and Be Blessed!