But our ideas are more subjected to choice; we can call them before us, and command their stay, we can facilitate and promote their recurrence, we can either repress their intrusion, or hasten their retreat. It is therefore the business of wisdom and virtue, to select among numberless objects striving for our notice, such as may enable us to exalt our reason, extend our views, and secure our happiness. But this choice is to be made with very little regard to rareness or frequency; for nothing is valuable merely because it is either rare or common, but because it is adapted to some useful purpose, and enables us to supply some deficiency of our nature.
–Dr. Samuel Johnson, The Rambler