The wise who, by means of meditation on his Self, recognises the Ancient, who is difficult to be seen, who has entered into the dark, who is hidden in the cave, who dwells in the abyss, as God, he indeed leaves joy and sorrow far behind."

In plain words: God, the ancient one, is hidden deep inside us, like something in a dark cave, and is hard to see. A wise person who finds God through meditation on the inner Self leaves both joy and sorrow far behind.