The fact that Jesus taught and healed out in the open air among regular people demonstrates that he did not exclude anyone from his ministry, unlike the religious leaders of his day. This is still applicable today. Jesus will bring you things that have never been offered to you.
1 John 3:8 New King James Version (NKJV)
8 He who sins is of the devil, for the devil has sinned from the beginning. For this purpose the Son of God was manifested, that He might destroy the works of the devil.
Jesus addresses issues of the heart and warns us to not follow examples of the religious leaders.
Matthew 5:20-21 New King James Version (NKJV)
20 For I say to you, that unless your righteousness exceeds the righteousness of the scribes and Pharisees, you will by no means enter the kingdom of heaven.
21 “You have heard that it was said to those of old, ‘You shall not murder, and whoever murders will be in danger of the judgment.’
God sees your heart and your reward from him must be a secret. Therefore do not make a show of your relationship with God. Rather just do the good works he commands you.
About the power of the tongue. It can save us or condemn us.
1 John 1:9 New King James Version (NKJV)
9 If we confess our sins, He is faithful and just to forgive us our sins and to cleanse us from all unrighteousness.
Jesus continues with a message about adultery.
Matthew 5:27-28 New King James Version (NKJV)
27 “You have heard that it was said to those of old, ‘You shall not commit adultery.’ 28 But I say to you that whoever looks at a woman to lust for her has already committed adultery with her in his heart.
So anger is equal to murder and lust is equal to adultery. These are profound truths and continually remind us that we have a savior who forgives us our sins if we confess them. That is the pathway to spiritual maturity.
“But I say unto you. . .” Christ speaks with authority when making and establishing the laws of the new covenant. There are some commandments included in the new covenant. It is not just ‘free will, baby’. But it is under grace and empowerment under that grace for us to be able to live it out.