4But when the kindness and love of God our Savior appeared, 5he saved us, not because of righteous things we had done, but because of his mercy. He saved us through the washing of rebirth and renewal by the Holy Spirit, 6whom he poured out on us generously through Jesus Christ our Savior, 7so that, having been justified by his grace, we might become heirs having the hope of eternal life.8This is a trustworthy saying. And I want you to stress these things, so that those who have trusted in God may be careful to devote themselves to doing what is good. These things are excellent and profitable for everyone.
Titus 3:4-8
Insufficient on its own. That is not the full gospel.
Look at His commands regarding Holy Eucharist in John 6.