Yogi: I can feel the sensations in detail when I walk. Now, I’m trying to find out the knowing of the sensations.

Sayadaw: You can know the knowing as surely as you know sensations. 

Although it doesn’t feel as solid as sensations, but you can be sure of it as you feel sure of sensations. 

Touch your fingers; do you know the touching?

Yogi: Yes.

Sayadaw: Are the knowing and the touching separate?

Yogi: Yes.

Sayadaw: You know the touching and you also know the knowing.

Yogi: Should I try to stay with the knowing?

Sayadaw: Yes. And if you know the knowing, you already know what it knows. When you know the knowing, touching is already known.