“It will be too late then to choose your side. There is no use saying you choose to lie down when it has become impossible to stand up. That will not be the time for choosing: it will be the time when we discover which side we really have chosen, whether we realised it before or not. Now, today, this moment, is our chance to choose the right side. God is holding back to give us that chance. It will not last forever. We must take it or leave it.
Every time you make a choice you are turning the central part of you, the part of you that chooses, into something a little different from what it was before. And taking your life as a whole, with all your innumerable choices, all your life long you are slowly turning this central thing either into a heavenly creature or into a hellish creature: either into a creature that is in harmony with God, and with other creatures, and with itself, or else into one that is in a state of war and hatred with God, and with its fellow-creatures, and with itself. To be the one kind of creature is heaven: that is, it is joy and peace and knowledge and power. To be the other means madness, horror, idiocy, rage, impotence, and eternal loneliness. Each of us at each moment is progressing to the one state or the other” (C. S. Lewis, Mere Christianity).
The Bible puts it another way:
“So remember: fear the Eternal and serve Him sincerely and faithfully. Put away from you any gods your ancestors served across the Euphrates River or in Egypt, and serve only Him. If you decide that you’re not willing to serve Him, then today is the day for you to choose whom you will serve, whether the gods your ancestors bowed to in the land beyond the great River, or the gods of the Amorites whose country you possess. But as for me and my family, we will serve the Eternal” (Joshua 24:14-15, The Voice).