It was not preached to a crowd of unbelievers , but to his disciples . The "crowds" were in the outer ring , the teaching was intended not for them , but for his disciples . (much as a church service should be organized. The intended audience the the faithful, with the others listening ...instead of the other way around)
Mat 5:1 And seeing the multitudes, he went up into a mountain: and when he was set, his disciples came unto him:
Mat 5:2 And he opened his mouth, and taught them, saying,
Here is an interesting link on the beatitudes
you're kidding right?
Ummm... try reading Chapter 7 verse 28. You think in 5:2 "he opened up his mouth and taught them" refers only to the disciples??
The disciples weren't anymore saved at that time than the crowd was. Several of them may not have even been true believers at that time. The Holy Spirit lived in none of them. Many in the crowd may have eventually been believers who received the Holy Spirit too. I think you're making a silly assumption.