The grace of God teaches us to say "No!" to sin and yes to righteousness (Titus 2: 11-14)
Jesus did not come to give us more laws, or to make us live under law.
He came, full of grace and truth (John 1:14), for grace and truth came through Him (John 1:17)
Jesus is all about grace.
He came to do and be nothing else.
"Jesus answered and said unto them, This is the work of God, that ye believe on him whom he hath sent." (John 6: 29)
Jesus exhorted His disciples during His earthly ministry:
"Heal the sick, cleanse the lepers, raise the dead, cast out devils: freely ye have received, freely give." (Matthew 10: 8)
Jesus was all about undeserved, unearned favor. Man is dead, and apart from Jesus, he can do nothing (John 15: 5).
So, if we learn anything else but Jesus and His grace in our lives, that is strange, foreign doctrine, and outside of the truth.
Paul warned the Body of Christ about those who would preach another Jesus:
"For if he that cometh preacheth another Jesus, whom we have not preached, or if ye receive another spirit, which ye have not received, or another gospel, which ye have not accepted, ye might well bear with him." (2 Corinthians 11: 4)
He was stunned into rage when the Galatians were carried away with the mixed doctrine of law brought back into believers' lives:
"I marvel that ye are so soon removed from him that called you into the grace of Christ unto another gospel:" (Galatians 1: 6)
John was emphatic about resisting people who taught anything but Jesus:
"Whosoever transgresseth, and abideth not in the doctrine of Christ, hath not God. He that abideth in the doctrine of Christ, he hath both the Father and the Son." (2 John 9)
With Jesus, we find all that we need, for in Him all things are met.
Anything besides Jesus and the grace of God is strange, wrong doctrine, and is to be rejected.