Idleness is a disease which must be combated; but I would not advise a rigid adherence to a particular plan of study. I myself have never persisted in any plan for two days together. A man ought to read just as inclination leads him: for what he reads as a task will do him little good. A young man should read five hours in a day, and so may acquire a great deal of knowledge.

Samuel Johnson (1709-1784) English writer, lexicographer, critic

Comment (9 Jul 1763)
    (Source)

In James Boswell, The Life of Samuel Johnson (1791)