Surely goodness and mercy shall follow me all the days of my life, and I shall dwell in the house of the Lord my whole life long.

Surely towb: good, pleasant, agreeable, joyful, valuable, charming, becoming better, beautiful...

and chesed: good, kind, lovely, loyal, loving, faithful, devoted... shall follow me all the days of my life.

There is a sense that towb is an experience of the external world while chesed describes our interior experience. Goodness is what we encounter. Mercy is what we bring with us to the encounter.

The prayer does not promise that towb is all we will encounter. Even in this short prayer there is talk of enemies, evil, and death's valley.

But when we open ourselves to God's chesed, even the deepest wounds we have caused or received can be healed.