Little children live intensely in the present moment, neither in the past nor in the future. As the French writer La Bruyre once put it, ‘Children have neither past nor future, but they have something we seldom have—they rejoice in the present.’I found the quote here. Click here to read my old posts (and links to others' posts) on this topic.
This is the child-like trait which the New Testament would have us imitate. Age quod agis—literally, ‘do what you are doing’…The future does not yet exist and the past is gone forever. What we have is the present moment. By it we are fashioning our eternity.… Fr. Thomas Dubay, SM, LIVING FAITH, Sept. 30, 2002
It's kind of funny to find this quote by Fr. Dubay, because I think I first mentioned this old Latin motto in a post about one of Fr. Dubay's books - but only because it reminded me of the motto, which I found in another book by a different author. It's neat that Fr. Dubay also appreciated this phrase; this quote is the nicest elucidation of the concept that I've come across.