When I first started meditating, I had this misconception that I could achieve a certain level of centeredness, and that once achieved, that level of centeredness would just stick.
The reality is that every moment we are drifting, which means that every moment is an opportunity to return to center.
And yet, our minds do a very good job of keeping us distracted with the constant stream of thoughts and emotions.
A quick way to return to center is to reconnect with our body. The body is an anchor that never leaves us so long as we are living and breathing. All we need to do is note our bodily sensations. No need to chase after and interpret thoughts. No need to judge emotions. All we need do is just observe what is happening in our bodies.
It is being with the present-moment reality of our bodies that we bring ourselves back.