From The Screwtape Letters—a fictional work written from a senior demon’s perspective, advising a junior tempter.

And the questions they do ask are, of course, unanswerable; for they do not know the future, and what the future will be depends very largely on just those choices which they now invoke the future to help them to make. As a result, while their minds are buzzing in this vacuum, we have the better chance to slip in and bend them to the action we have decided on. And great work has already been done. Once they knew that some changes were for the better, and others for the worse, and others again indifferent. We have largely removed this knowledge. For the descriptive adjective ‘unchanged’ we have substituted the emotional adjective ‘stagnant’. We have trained them to think of the Future as a promised land which favoured heroes attain—not as something which everyone reaches at the rate of sixty minutes an hour, whatever he does, whoever he is,

…

You see how it is done? If each side had been frankly contending for its own real wish, they would all have kept within the bounds of reason and courtesy; but just because the contention is reversed and each side is fighting the other side’s battle, all the bitterness which really flows from thwarted self-righteousness and obstinacy and the accumulated grudges of the last ten years is concealed from them by the nominal or official ‘Unselfishness’ of what they are doing or, at least, held to be excused by it.

The Screwtape Letters
C. S. Lewis