Presence makes it easier
– to be aware of one’s feelings;
– to choose or change them at will;
– to choose to be happy, since seldom is anything actually happening “here and now” to be upset about.
We got called into the shower, and this guy cut in front of me to get to the clothes window, and he was taking a long, long time. An eternity. Now, me? I finish at the clothes window in an instant. (Related: Practical advantages of being a nice guy.) So it made it easier for me to grouse that this ay-ho was taking so damn long.