Boredom therefore can arise from the cessation of habitual functions, even though these may be boring too. It is also the shriek of unused capacities, the doom of serving no great end or design, or contributing to no master force.
Saul Bellow (1915-2005) Canadian-American writer The Adventures of Augie March (1953)
(Source)
The ambitious deceive themselves when they propose an end to their ambition; for that end, when attained, becomes a means.
François VI, duc de La Rochefoucauld (1613-1680) French epigrammatist, memoirist, noble Réflexions ou sentences et maximes morales [Maxims], # 32 (1665-1678)