The tortoise, as soon as he likes he discloses his senses, and when he likes he pulls them within. That is the position of a pure devotee. He can wind up the senses whenever he likes and he can exhibit the senses whenever he likes. On the whole, the senses are under his control. He is not under the control of the senses as are the ordinary persons. That is the meaning of Goswami.

From Srila Prabhupada’s letter to Himavati — Hawaii 23 March, 1969