Mark 13:33-37 (ESV)
Be on guard, keep awake. For you do not know when the time will come.  It is like a man going on a journey, when he leaves home and puts his servants in charge, each with his work, and commands the doorkeeper to stay awake.  Therefore stay awake—for you do not know when the master of the house will come, in the evening, or at midnight, or when the cock crows, or in the morning—  lest he come suddenly and find you asleep.  And what I say to you I say to all: Stay awake."
Jesus illustrates the matter with a parable. There is something deeper here. It isn’t just about the second coming. No one knows that day or hour either. But neither do you know when you will meet your own personal judgment day. It is risky business to bet on youth or good health. Death comes for us all and we know not when, where or in what form. We cannot afford to fall asleep, to put the faith off for another day. Today is the day of salvation. Today is the day when he may be found. Every day we have is a day we live by the Grace of God. It’s useful to remember that when you wake up. It’s useful to remember that as you take your morning shower and remember the waters of Grace that gave you the gift of the Holy Spirit. It is useful to remember that and start your day with prayer and devotion. To remember that it is a day of grace and let your faith shape the day ahead of you. Let it be a day to grow in faith and love, and not a day for it to diminish, to make use of the gifts God has given you, his word, prayer, and vocation. Then it is that every day is a day of joy, no matter what happens. Perhaps not always a day of happinesss, but a day of Joy, knowing you live in God’s hands. If you live you live to his glory, you eat and drink to his glory, if you die you die in the faith, called home as it were to live for eternity. As Paul says, “To live is Christ, to die is gain” (Philippians 1:21). So it is every day of every Christians life.