Always practice Advaita in your mind but never practice it in your deeds. To attain redemption one can embrace the three worlds [this one and those above it and below it] with the Advaita [outlook, seeing everything as one] but with the pre-eminent Guru, [this attitude] is totally improper.
~ Guru Vachaka Kovai (801)
Bhagavan: My son, you should experience Advaita within your Heart at all times, but never, even for a moment, should you express it in your outward actions. Advaita is appropriate in all the three worlds, but it is never appropriate in relation to the Guru."