Young man: But sharpening the senses, how does one sharpen one's senses?
Prabhupāda: Senses are imperfect. Just like we are very proud of our eyes to see, but you cannot see what is beyond the wall. Therefore it is conditioned. You cannot see without light. That, how you can be sure that your eyes are perfectly seeing? That is not possible, because the eyes can see under certain condition. So if it is conditioned, then it is not perfect. But the conditioned sight can be purified. Just like one is suffering from cataract. By surgical operation the cataract can be removed and he can see. Similarly, our senses are imperfect. If we purify the senses, then it will be possible to see God twenty-four hours. That purification process is this Kṛṣṇa consciousness movement.