To not be concerned by the pushing of the mind and the senses and to control this mind and senses – That is the business of a sanyassi. He is simply like the tortoise described in the Gita, he withdraws his limbs, he will not act even if the mind and senses are pushing he will not act. But for devotional service he will extend his limbs and he will act. So he’ll engage the mind in service, he’ll engage the senses in service but otherwise not.
(Kadamba Kanana Swami 09/03/2010)