The Sermon on the Mount is both an exposition of the law ('you have heard it said...but I say unto...') and a gracious invitation ('Ask, and it shall be given you; seek, and ye shall find;...how much more shall your Father which is in heaven give good things to them that ask him?').

The One who said 'Be ye therefore perfect, even as your Father which is in heaven is perfect' also said 'with men this is impossible; but with God all things are possible.'

He who said 'Repent: for the kingdom of heaven is at hand' also said 'Come unto me, all ye that labour and are heavy laden, and I will give you rest. Take my yoke upon you, and learn of me; for I am meek and lowly in heart: and ye shall find rest unto your souls. For my yoke is easy, and my burden is light.'

__________________
Andrew