God wasn’t content to see man lost in sin, so He declared him worthy of His love! -- worthy of His Son. What grace! What love!
John 3:16 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.
The saved man/woman has believed on Jesus Christ, His finished work at the cross and His resurrection from the dead as his only hope of salvation and eternal life.
The lost man/woman has not believed on Him. He may trust many things, like works, religion, church membership, etc, but he is not trusting the one and only Person Who can save the soul and give eternal life, Jesus Christ.