The Nature of Regret

Inherent in regret is the holding on to the past. If you look at any regret you have, you will see that your thoughts are dwelling outside the present. More often than not, the feeling that you have is one of loss, because what was, in the past no longer is, in the present.
If you will instead focus on the present, and remain steadfast in your focus on the present, you will gain a sense of power. The past cannot have power unless you give it power. The present is the only true source of power. So the present gives us power, and we are free to give up power to the past (and the future in the form of worry). But in giving up power to the past, we feed the feeling of loss. We are free to choose again and again, to bring our thoughts back to the present. In the present we will find our true comfort and meaning.