Source: The Gospel of Sri Ramakrishna
What riches can you give to God?
When the Radhakanta's ornament was stolen, Sejo Babu (son-in-law of Rasmani) went to the Radhakanta Temple and said to the deity, 'Fie on you, Thakur (God)! You could not guard your own ornaments!'
I (Sri Ramakrishna Paramahamsa) said to Sejo Babu, 'What an intelligence you have! He who has Lakshmi herself for His handmaid, He whose feet she massages, how can He lack splendour? The jewellery is something very precious for you, but for the Lord it is just a few clods of earth. Fie on you! You should not talk so unintelligently. What riches can you give to God?'
Sri Sri Muralidhara Swamiji
If you want something from someone, you have to make him happy. Only then you will receive what you want. Similarly, if you want God's grace, you should make Him happy, and the easiest way to do that is by chanting the Maha Mantra!