The most famous verse of Scripture throughout the world is John 3:16.  Why is it so famous? Because it captures the essence of the gospel in a few succinct words. 

"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."

Every word is essential and adherence to this brief remedy for your soul is the difference between being saved and lost.