John 3:16 can be abbreviated as an acronym to spell the word GOSPEL when we read it God so loved the world that he gave his Only begotten Son that whosoever believes in him shall not Perish but have Everlasting Life and in verity and entirety, that is THE GOSPEL.

The letter to the Romans refers to the “gospel” 3 times in the very first chapter. In verse 1, it is referred to as the gospel of God, in verse 9, it is referred to as the gospel of his Son and in verse 16, it is referred to as the gospel of Christ. Verse 16, also provides us insight into what the gospel is, what it can do and to whom. Romans 1:16 reads “For I am not ashamed of the gospel of Christ: for it is the power of God unto salvation to every one that believeth; to the Jew first, and also to the Greek.”

Who’s is the Gospel? Gospel of God (Romans 1:1); Gospel of His Son (Romans 1:9); Gospel of Christ (Romans 1:16). The ORIGIN of the Gospel is God a.k.a. His Son a.k.a. Christ and not any man.
What is the Gospel? It is the power of God. (Romans 1:16). The OPERATION of the Gospel is the power of Almighty God that tears down strongholds.
What can the Gospel do? In one word – Saves (power of God unto salvation). The  OUTCOME of the Gospel is salvation.
Whom can the Gospel save? Everyone that believes. The OUTREACH of the Gospel is non-discriminatory to anyone and is inclusive of everyone who believes.

Romans 1:16 (KJV)
16 For I am not ashamed of the gospel of Christ: for it is the power of God unto salvation to every one that believeth; to the Jew first, and also to the Greek.