If we refuse to think of anything except what we are doing or the person that we are with, we develop the habit of being present to the present moment. In a way, the present moment becomes as sacred as being in church. Far better to be present to your duty if you are a bartender, than to be present in church and to be thinking about being in a bar. At least you are present to yourself when you are paying attention to what you are doing.
Attention, then, is a way of doing what we are doing. It cracks the crust of the false self (our psychological awareness of daily life) in which we are the center of the universe while everything else is circling around our particular needs or desires. This is an illusion, but unfortunately it is the heritage we all bring with us from early life.