"The Spirit of the Lord is on me, Because he has anointed me to preach good news to the poor. He has sent me to heal the brokenhearted, To proclaim release to the captives, Recovering of sight to the blind, To deliver those who are crushed,
When He sat down, that was indicative of the fact that He was now going begin to teach. The rabbis always sat when they taught. And so He stood to read the scriptures. But having read them, then in sitting down, he was signifying to the people He is now going to teach us the scriptures.