"...that whomsoever believes in Him will not perish, but will have life everlasting."
God gave this one condition to access eternal life. Jesus again says "If you love me, you will keep my commandments" and what is the commandment of christ? Love! Love the Lord your God and love your neighbour as yourself.
Believing in Jesus is an act of faith, and you must exercise that faith daily in your life by trusting Him in all that you do.
Thanks for sharing this! @odsam2