Jesus says we need to be perfect to enter God's Kingdom. But why? Why does God expect this of us?

As Jesus finishes out teaching the heart of God's Law in Matthew 5, He says a few things that give us an answer to this question.

Intro/Outro Song Title: River MeditationArtist: Jason ShawSource:http://freemusicarchive.org/music/Jason_Shaw/Audionautix_Acoustic/RIVER_MEDITATION___________2-58License:(CC BY 3.0 US)