We value present pleasure more than future pleasure, and pleasure in the near future more than pleasure in the distant future.
 Bertrand Russell, A History of Western Philosophy (1945). copy citation

Context

“But this is less satisfactory than the reconciliation of public and private interests effected by means of heaven and hell, both because lawgivers are not always wise or virtuous, and because human governments are not omniscient. Locke has to admit, what is obvious, that men do not always act in the way which, on a rational calculation, is likely to secure them a maximum of pleasure. We value present pleasure more than future pleasure, and pleasure in the near future more than pleasure in the distant future. It may be said—this is not said by Locke—that the rate of interest is a quantitative measure of the general discounting of future pleasures. If the prospect of spending $1000 a year hence were as delightful as the thought of spending it today, I should not need to be paid for postponing my pleasure.” source