“A mind of moderate capacity which closely pursues one study must infallibly arrive at great proficiency in that study.”

“If the study to which you apply yourself has a tendency to weaken your affections and to destroy your taste for those simple pleasures in which no alloy can possibly mix, then that study is certainly unlawful, that is to say, not befitting the human mind.”

“In other studies you go as far as other have gone before you, and there is nothing more to know; but in a scientific pursuit there is continual food for discovery and wonder.”

“Yet from whom has not that rude hand rent away some dear connexion; and why should I describe a sorrow which all have felt, and must feel? The time at length arrives, when grief is rather an indulgence than a necessity; and the smile that plays upon the lips, although it may be deemed a sacrilege, is not banished.”

“I need not describe the feelings of those whose dearest ties are rent by that most irreparable evil, the void that presents itself to the soul, and the despair that is exhibited on the countenance. It is so long before the mind can persuade itself that she whom we saw every day and whose very existence appeared a part of our own can have departed forever—that the brightness of a beloved eye can have been extinguished and the sound of a voice so familiar and dear to the ear can be hushed, never more to be heard. These are the reflections of the first days; but when the lapse of time proves the reality of the evil, then the actual bitterness of grief commences. Yet from whom has not that rude hand rent away some dear connection? And why should I describe a sorrow which all have felt, and must feel? The time at length arrives when grief is rather an indulgence than a necessity; and the smile that plays upon the lips, although it may be deemed a sacrilege, is not banished. My mother was dead, but we had still duties which we ought to perform; we must continue our course with the rest and learn to think ourselves fortunate whilst one remains whom the spoiler has not seized.”

“A human being in perfection ought always to preserve a calm and peaceful mind and never to allow passion or a transitory desire to disturb his tranquility. I do not think that the pursuit of knowledge is an exception to this rule. If the study to which you apply yourself has a tendency to weaken your affections and to destroy your taste for those simple pleasures in which no alloy can possibly mix, then that study is certainly unlawful, that is to say, not befitting the human mind. If this rule were always observed; if no man allowed any pursuit whatsoever to interfere with the tranquillity of his domestic affections, Greece had not been enslaved, Caesar would have spared his country, America would have been discovered more gradually, and the empires of Mexico and Peru had not been destroyed.”

“My reign is not yet over... you live, and my power is complete. Follow me; I seek the everlasting ices of the north, where you will feel the misery of cold and frost to which I am impassive. You will find near this place, if you follow not too tardily, a dead hare; eat and be refreshed. Come on, my enemy; we have yet to wrestle for our lives; but many hard and miserable hours must you endure until that period shall arrive.”