The heart has to be the precious treasure of joy. Normally, one does not know the key to open its lock.  That key is repetition of the Name of the Lord, with a pure heart. Purify the heart with Truth, Right Action, Peace and Non-Violence. Always endeavor to do good to others, to think well of them and to speak well of others. This endeavour will wear away your egoism and attachment to things that cater to your pleasures.  Do not behave like birds and beasts always engaged in earning a living or rearing a family.  Struggle for higher things, use the higher talents with which you are endowed.

- Sathya Sai Speaks,  Vol 5, Ch 27, Apr 4, 1965. 

"Pure heart is all Sadhana" - Baba