Only two kinds of people can attain self-knowledge: those who are not encumbered at all with learning, that is to say, whose minds are not over-crowded with thoughts borrowed from others; and those who, after studying all the scriptures and sciences, have come to realise that they know nothing.
God reveals Himself to a devotee who feels drawn to Him by the combined force of these three attractions: the attraction of worldly possessions for the worldly man, the child's attraction for its mother, and the husband's attraction for the chaste wife. If one feels drawn to Him by the combined force of these three attractions, then through it one can attain Him.
The waves belong to the Ganges, not the Ganges to the waves. A man cannot realize God unless he gets rid of all such egotistic ideas as "I am such an important man" or "I am so and so". Level the mound of "I" to the ground by dissolving it with tears of devotion.
The truth is that you cannot attain God if you have even a trace of desire. Subtle is the way of dharma. If you are trying to thread a needle, you will not succeed if the thread has even a slight fiber sticking out.
As the shell, the pith and the kernel of the fruit are all produced form one parent seed of the tree, so from the one Lord is produced the whole of creation, animate and inanimate, spiritual and material.