“Let us remember that the life in which we ought to be interested is “daily” life.  We can, each of us, only call the present time our own….Our Lord tells us to pray for today, and so he prevents us from tormenting ourselves about tomorrow.  It is as if [God] were to say to us: “[It is I] who gives you this day [and] will also give you what you need for this day. [It is I] who makes the sun to rise.  [It is I] who scatters the darkness of night and reveals to you the rays of the sun.”

-Gregory of Nyssa On the Lord’s Prayer