The Greek word in the NC "Euengelian" means Gospel or Good News. Really, this is the whole Word of God, for the Gospel that Paul preached came right out of the OC and then spoke/wrote the New Covenant, saying "For I did not shrink from declaring to you the whole counsel of God" Acts 20, and "all Scripture (OC/Holy Writings/"hiera grammata" and NC/Scripture/"graphe" v15-16) is God-Breathed or given by Inspiration of God and is useful for teaching, rebuking, correcting and training in righteousness."
But, the summary of the whole word of God, that is given in many verses, is salvation, the Greek word "sozo" which means "salvation/justification, healing, deliverance, protection, wholeness, etc." This is salvation for the whole person, spirit, soul and body, or, mentally, emotionally, physically, and spiritually. Just as Jesus would "save"/"sozo" the whole person, as in Acts 3 the paralyzed man stood up and walked and was physically healed/sozo, he leaped for joy and was mentally/emotionally whole/healed, and he praised God and was spiritually saved/delivered from sin and demons (Acts 10, Luke 13). And the with the leper in Mark 1, Jesus said to him be clean and he was physically healed/sozo, He reached out and touched him and he was mentally/emotionally whole/sozo (as a leper he hadn't had any physical human contact), and He had him go and show himself to the priest so he could get spiritually saved/sozo and socially/relationally restored/whole/sozo after being declared clean by the priest he would be allowed back into the community (Lev. 13-14).
How this happens, is through the kingdom/Kingly DOMinion of God, coming to earth as it is in Heaven (Matt. 6/Lk. 11). This is to happen in all of life, in the market place, in the church ministry, in the slums, in the education field, in the atmosphere, in the environment, etc. all of the earth as it is in Heaven. Especially the Seven Mountains/Mind Molders of Society (see reclaimsevenmountains.com) of arts & entertainment, media, family, religion, education, government, and business. For those who take these "high places" will have the kingdoms of the earth. For this to happen, we need to walk in the fruit (9 listed in Gal. 5) and gifts (9 listed in 1Cor. 12) of Holy Spirit, His whole person.
As Jesus' kingdom comes, salvation/sozo is manifested to the whole person, and so to all of of life. This is the Gospel that Jesus, the Apostles, the Disciples Preached (Matt 10, Lk 9, Lk 10, Mrk 3, Mrk 6, Acts 2, Acts 3, Acts 14, Ro 10, etc.), & the same we're to Proclaim (Matt 28, Acts 1, Ro 10, etc.
I have done & seen this happen many times myself, people loved supernaturally, had their needs met that couldn't, clothed the naked, be prophesied specific supernatural words of knowledge & wisdom & destiny that no human could know, deaf ears open, heart conditions healed, foot bone chip restored, seizures cease, believe on Jesus & transfer from the kingdom of darkness to light, & so much more, all in the Name of Jesus Christ.
I pray & release that your, my, & all our eyes be opened to see God & His truth, grace, kingdom, power, love, & all these things, & that we declare a Gospel that full and whole & complete of the Word of God, bringing the full King’s Dominion of God to earth as it is in Heaven, in the Name of Jesus Christ, amen.