Agathil nee ilayo Arunachala
Arunachala! When the five thieves that are the senses enter my heart/mind which is where you reside, are you not there as witness?
When the owner of the house is there how can robbers dare to enter? When you, the all pervading Lord, are standing as witness, how come you did not see the five thieves (Bhagavan implies the Lord was there by asking negatively)? So they must have your implicit consent.
The hidden meaning is that Arunachala is living in the heart of everyone. Those who have experiential knowledge will have no room for sense-thieves to enter and stay.