Note from 'Visits Sheffield' chapter from 'Memoirs Of My Life And Writing' by Gibbon

The proportion of a part to the whole is the only standard by which we can measure the length of our existence. At the age of twenty, one year is a tenth, perhaps, of the time which has elapsed within our consciousness and memory: at the age of fifty it is no more than the fortieth, and this relative value continues to decrease till the last sands are shaken by the hand of death. This reasoning may seem metaphysical; but on a trial it will be found satisfactory and just. The warm desires, the long expectations of youth, are founded on the ignorance of themselves and of the world: they are gradually damped by time and experience, by disappointment and possession; and after the middle season the crowd must be content to remain at the foot of the mountain; while the few who have climbed the summit aspire to descend or expect to fall. In old age, the consolation of hope is reserved for the tenderness of parents, who commence a new life in their children; the faith of enthusiasts, who sing Hallelujahs above the clouds; and the vanity of authors, who presume the immortality of their name and writings.