Thirumbavutraen arum Arunachala
Arunachala! I lost you in the endless space-consciousness (chit akasam) of heart but with your grace I found (attained) you again.
Theeram means shore (it also means bravery in a different context) or bank (nadhi theeram = river bank). Endless heart refers not to the physical organ but to the chitakasam. Since god resides as the heart in the heart, one should search for him to attain him (at the same time one does not either find or lose Arunachala who lives in the heart).
Due to timeless vasanas (tendencies carried over from previous lives) and the consequent illusions and delusions, and the ever-outward-bound mind’s nature, it feels like it has been found again. And it finally reaches Arunachala with his grace.
Another meaning is: I attempted to find you in my heart when you are present everywhere, but I lacked the courage and strength needed for that pursuit so I gave up. Still, in the endless omnipresence of the heart’s expanse, my striving did not go to waste as I reached you by your grace.