Why You Should Be Ashamed - John MacArthur (Mark 8:38-9:1)
http://www.gty.org/video/Pulpit/V8241-42
Mark 8:38-9:1

38 For whoever is ashamed of Me and My words in this adulterous and sinful generation, the Son of Man will also be ashamed of him when He comes in the glory of His Father with the holy angels."

Mark 9
1 And Jesus was saying to them, "Truly I say to you, there are some of those who are standing here who will not taste death until they see the kingdom of God after it has come with power."