Compassion
Compassion is an essential element of love.
Substance of Bhakti
Substance of Bhakti is Surrender and Humility.
Experiencing Pure Love of God
Pure water means you do not add anything, but take out all contamination. Similarly pure love means you don't put rather you take all dirt out of your heart. Then you experience pure Love of god.
Origin of Law of Karma
Law of Karma originates in mercy of the Lord.