"Japa means repeating the Name of the Lord silently, sitting in a quiet place. If one continues the repetition with concentration and devotion, one is sure to be blessed with Divine visions ultimately - one is sure to have God-realization. Suppose a big log of wood is immersed in the Ganges with one end attached to a chain, which is fixed on the bank. Following the chain, link by link, you can gradually dive into the water and trace your way to it. In the same manner, if you become absorbed in the repetition of His holy Name, you will eventually realize Him."
-Sri Ramakrishna