A diminished propensity to consume to-day can only be accommodated to the public advantage if an increased propensity to consume is expected to exist some day.
 John Maynard Keynes, The General Theory of Employment, Interest and Money (1936). copy citation

Context

“New capital-investment can only take place in excess of current capital-disinvestment if future expenditure on consumption is expected to increase. Each time we secure to-day's equilibrium by increased investment we are aggravating the difficulty of securing equilibrium to-morrow. A diminished propensity to consume to-day can only be accommodated to the public advantage if an increased propensity to consume is expected to exist some day. We are reminded of 'The Fable of the Bees'3⁄4the gay of tomorrow are absolutely indispensable to provide a raison d'être for the grave of to-day. It is a curious thing, worthy of mention, that the popular mind seems only to be aware of this ultimate perplexity where public investment is concerned, as in the case of road-building and house-building and the like.” source