Clive Staples Lewis. The Screwtape Letters (№ 419245)

The enemy's ideal is a person who, having worked a day for the benefit of future generations (if this is his vocation), in the evening postpones all care, completely entrusting himself to heaven, and remains only with the patience and gratitude that are required of him here and now. We need a person tormented by the nightmares of the future, persecuted by the ideas of an impending paradise or hell on earth, ready to transgress the Enemy's commandments now if we convince him that by doing this he will bring closer or avert something that he will not even see in his lifetime. We would like the human race to constantly and in terrible agony try to grab the mind with its hands, so that this race would never be honest, kind and happy, and that everything given to it in the present would be carried to the altar of future times.