A grateful heart is not one that is very selective and choosy about what to be grateful for.
Arrogance repels the Lord; humility attracts the Lord.
Lord's love manifests in this world as compasssion.
Actual Gratitude is the Symptom of Humility.
A virtue which is divine is humility.
When we face difficulties and still remain faithful to Krishna and spiritual master we access the infinite mercy of their hearts.