ī will not speak to anyone other than ṣrīvaishṇavas (who are servitors of emperumān) —

 Constructed using rocks, and surrounded by big towering walls, —

agitating by rising and falling —

 high in tone —

 very tall —

being present in all ten directions —

being present in all directions, being present in lower and higher regions —

 became brahmarishi (due to that) —

 grown —

top most —