Do not dwell in the past, do not dream of the future, concentrate the mind on the present moment. – Buddha
Which is why the Now moment is called the eternal present. The now moment is all that exists.
When we recollect the past, it’s all in our thoughts, when we envision or worry about the future it’s all in our thoughts, it’s made up reality. This doesn’t mean we don’t reminisce on pleasant memories or design a favorable future, but it does mean that all the action is in the NOW!
To be most happy, to be healthy and disease free we ought to focus our awareness on what’s going on right now, to fully live it and to fully enjoy it!
Like they say “Yesterday is history, tomorrow a mystery, today is a gift, hence it’s called the Present!”