There is nothing more fatal to a man whose business is to think, than to have learned the art of regaling his mind with those airy gratifications. Other vices or follies are restrained by fear, reformed by admonition, or rejected by the conviction which the comparison of our conduct with that of others may in time produce. But this invisible riot of the mind, this secret prodigality of being, is secure from detection, and fearless of reproach. The dreamer retires to his apartments, shuts out the cares and interruptions of mankind, and abandons himself to his own fancy; new worlds rise up before him, one image is followed by another, and a long succession of delights dances round him. He is at last called back to life by nature, or by custom, and enters peevish into society, because he cannot model it to his own will. He returns from his idle excursions with the asperity, though not with the knowledge of a student, and hastens again to the same felicity with the eagerness of a man bent upon the advancement of some favourite science. The infatuation strengthens by degrees, and, like the poison of opiates, weakens his powers, without any external symptoms of malignity.
It happens, indeed, that these hypocrites of learning are in time detected, and convinced by disgrace and disappointment of the difference between the labour of thought and the sport of musing. But this discovery is often not made till it is too late to recover the time that has been fooled away. A thousand accidents may, indeed, awaken drones to a more early sense of their danger and their shame. But they who are convinced of the necessity of breaking from this habitual
