God of Comfort and Challenge

In three separate readings, Jeremiah 17:5-10, the first Psalm, and Luke 6:17-26, we hear words of healing, of blessing, and of warning.

Jesus meets all who follow him for his Sermon on the Plain on a level playing field.  There are no favorites, and there is no one left out.  Even the healing Jesus provides is for all.

When Jesus speaks of God's blessings and warnings to those gathered around him, is he providing practical advice?  Or is he speaking more to how God sees and responds with compassion to the suffering of our brothers and sisters, and what may become of us when we are called to do the same but turn inwards instead?

How does Luke's Sermon on the Plain differ from Matthew's Sermon on the Mount?  What does Jeremiah and the Psalmist reveal about what types of actions bless and sustain us?