Date: April 26, 1695; 1708

"Meditating by one's self is like digging in the Mine; it often, perhaps, brings up maiden Earth, which never came near the Light before; but whether it contain any Metal in it, is never so well tried as in Conversation with a knowing judicious Friend, who carries about him the true Touch-stone, ...

— Locke, John (1632-1704)

Date: 1793

"To solace mental fatigue by the amusements of fancy, is no loss of time. Students know how often the eye is busied in wandering over the page, while the mind lies in torpid inactivity; they therefore compute their time, not by the hours consumed in study, but by the real acquisitions they obtain...

— Disraeli, Isaac (1766-1848)