uzhl̤aththĕ
āzhvār begins by reflecting on the fact that emperumān dwells within the heart, the very center of all thoughts. If emperumān were to reside outside, he would only know what the eyes perceive. But since He resides inside, He knows everything that goes on in the heart, making it impossible to deceive Him.
uṛaiyum
āzhvār emphasizes that emperumān