Krishna is merciful but Lord Caitanya is Mahavadanyay, that is, the most merciful. We are the most fallen ones; therefore we should seek Mahaprabhu’s mercy.
The conditioned soul cannot revive his Krishna consciousness by his own effort but out of causeless mercy, Lord Krishna compiled the Vedic literature and its supplements, the Puranas.
We follow all these regulative principles to get the mercy of the Lord, but it’s that mercy that carries us beyond material conceptions. There is no other way. Ultimately we are simply begging for mercy. If you are not begging, you are not going to get it.
Law of Karma originates in mercy of the Lord.
Our advancement is not because of our endeavor but Krishna's mercy, which is withdrawn when He sees pride within us.
When you treat people properly rather than manipulate, exploit or be selfish, you attract the mercy of the Lord in the spirit of servitude.