The Buddha was talking with Uttara, a young pupil of the bhramin Parasariya:
-Uttara, does Parasariya teach you how to develop your faculties?
-Yes, Master Gotama, he does teach us how to develop our faculties
-How does he do...
Sometimes I am confused whether I am thinking thoughts, or whether thoughts enter from elsewhere. Because it is impossible to think a thought and recognize you are the thinker while you are thinking the thought.
Try to be aware of a your mind and at the same time try to recite something in your head. It doesn't work. At best it is an on-off switch (thought-thinker-thought-thinker...)