Heb 4:12 For the word of God is living and active and sharper than any two-edged sword, and piercing as far as the division of soul and spirit, of both joints and marrow, and able to judge the thoughts and intentions of the heart.
Mat 5:17 "Do not think that I came to abolish the Law or the Prophets; I did not come to abolish but to fulfill.
Mat 5:21 "You have heard that the ancients were told, 'YOU SHALL NOT COMMIT MURDER' and 'Whoever commits murder shall be liable to the court.'
Consider how Jesus equates anger with murder and He says the accountability of derision (borne of anger) is not just the court, but the supreme court and God Himself.
Mat 5:48 "Therefore you are to be perfect, as your heavenly Father is perfect.
Mat 15:18 "But the things that proceed out of the mouth come from the heart, and those defile the man.