Even if tomorrow never comes, I have been in this day that you lived.  I am in every day that you live and that is why I ask you to live one day at a time and live it to its fullest. There is a mighty works that needs to be accomplished for the Kingdom of Light, and we do not have time to worry about tomorrow.

John 9:4 (ESV)
4 We must work the works of him who sent me while it is day; night is coming, when no one can work.

Romans 13:11-14 (ESV)
11 Besides this you know the time, that the hour has come for you to wake from sleep. For salvation is nearer to us now than when we first believed.
12 The night is far gone; the day is at hand. So then let us cast off the works of darkness and put on the armor of light.
13 Let us walk properly as in the daytime, not in orgies and drunkenness, not in sexual immorality and sensuality, not in quarreling and jealousy.
14 But put on the Lord Jesus Christ, and make no provision for the flesh, to gratify its desires.