When there is a King with a people, it is wise for the King to lay out the laws of the Kingdom. The sermon on the mountain explains to Christ's followers New Covenant living.
Matthew 5:1-2 (KJV)
And seeing the multitudes, he went up into a mountain: and when he was set, his disciples came unto him: And he opened his mouth, and taught them, saying...
Matthew 5:10-12 (KJV)
Blessed are they which are persecuted for righteousness' sake: for theirs is the kingdom of heaven. Blessed are ye, when men shall revile you, and persecute you, and shall say all manner of evil against you falsely, for my sake. Rejoice, and be exceeding glad: for great is your reward in heaven: for so persecuted they the prophets which were before you.
Matthew 5:13-16 (KJV)
Ye are the salt of the earth: but if the salt have lost his savour, wherewith shall it be salted? it is thenceforth good for nothing, but to be cast out, and to be trodden under foot of men. Ye are the light of the world. A city that is set on an hill cannot be hid. Neither do men light a candle, and put it under a bushel, but on a candlestick; and it giveth light unto all that are in the house. Let your light so shine before men, that they may see your good works, and glorify your Father which is in heaven. Blessed are they which are persecuted for righteousness' sake: for theirs is the kingdom of heaven.