If you use them for gratifying your senses, then you go down and down and down to the animal life. And if you use them for understanding God and His kingdom and your life, your relationship, that is also possible. So both way you can use your intelligence, your mind, your senses. Both ways.
So this Kṛṣṇa consciousness movement is to engage the mind, the senses, the intelligence always in Kṛṣṇa. Then there is no chance of materially being contaminated. Just like if you keep yourself always in the sunlight there is no chance of coming down into darkness. The darkness cannot penetrate light. Light can penetrate darkness. This is our practical experience. You cannot make sunlight dark, but your darkness can be lighted by sunlight.
Similarly, if you keep yourself in Kṛṣṇa consciousness, there is no chance of coming māyā and attack you. No. That is not possible. But if you forget Kṛṣṇa, then māyā immediately can catch you. Just like side by side there is darkness and light. If you keep yourself light, there is no darkness, and if you keep yourself in darkness . . .
So you have to use your intelligence. God has given you intelligence, mind, senses, and you have to utilize them. If you utilize, then you become free from these clutches of māyā, or being covered by the three modes of material nature, ignorance, passion, even goodness. Even you become a very good man, moralist, that is also a bondage. That is also your bondage.