Task: Question Answering
Input (English): Context: One of the people at home group on Wednesday night was talking about times in your life when the door of opportunity swings open before you , a chance that does not come your way often , a time in your life when rapid growth and change and the favour of God and men rests on you in a special way . And it is those times when you fling yourself through the doorway with force . You go ahead full speed , you seize the day and the hour and the minute , you ride this grace for however long it lasts , and you put your back and your legs and your heart into it so that you can cover as much ground as possible . 
Question: Why should we fling ourselves through the doorway with force ?
Output (English): Because opportunities do n't last forever .