In today's Gospel reading from Luke 9 at Mass, Jesus said to some would-be followers, "No one who sets a hand to the plow and looks to what was left behind is fit for the Kingdom of God." For us, it means that we must go all out in following God. This is as it should be. It's very much like competing in a race. One should run as fast as he can without looking back if he wants to be rewarded with eternal happiness in heaven at the end.