A . . . great distraction at times are so-called "running commentary" thoughts such as, "Now I am not thinking of anything," "Things are going very well now," "This is dreadful; my mind just won't stay still" and the like . . . . All such thoughts should simply be noted as "Thinking," and, as Huang Po says, just "dropped like a piece of rotten wood." "Dropped," notice, not thrown down. A piece of rotten wood is not doing anything to irritate you, but is just of no use, so there is no point in hanging on to it. . . . Nor is there any need to try to retrace the links in a chain of associated thoughts, nor to try to ascertain what it was that first started the chain. Any such impulse should itself be noted simply as "Thinking," and the mind should revert to the breathing. However badly things have just been going, one should take up again at the only place one can - where one is - and go on from there.
~ Bhikkhu Mangalo, The Practice of Recollection