Yogi: There is tension in the body and anger is linked to it. I’m aware of the reaction and can watch in a balanced way when the mind becomes quiet. It repeats the next day – it appears that there’s something I don’t understand and the awareness is just like a tranquilizer. 

Sayadaw: There is no reason why the bodily tension shouldn’t come up again regardless of whether you understand or not. What you’re watching for is whether the mind is reacting.

The tension in the mind because of a defilement is due to lack of understanding, but bodily tension may just be there.

Yogi: But I don’t know why I’m angry.

Sayadaw: On the second day, when the tension in the body is still there and aversion arises too, then something is still not understood. Wisdom may be weak in that moment.

If you understand that what is being experienced is just an object, that understanding helps the mind not to react instantly to the experience because every experience is seen as an object, that which is being known.

It is not difficult to understand that.