Do not refer to your toy-books, and say you have seen that before. Answer me rather, if I ask you, have you understood it before?

I am, I hope, very thankful that in the withdrawal of the powers and things of life, the good hope is left with me, which makes the contemplation of death a comfort — not a fear. Such peace is alone the gift of God, and as it is He who gives it, why should we be afraid? His unspeakable gift in His beloved Son is the ground of no doubtful hope, and there is the rest for those who (like you and me) are drawing near the latter end of our terms here below. I do not know, however why I should join you with me in years. I forget your age, but this I know (and feel as well) that next Sabbath day (the 22nd) I shall complete my 70th year. I can hardly think myself so old as I write to you — so much of cheerful spirit, ease and general health is left to me, and if my memory fails, why it causes that I forget troubles as well as pleasure and the end is, I am happy and content.

I have not been at work except in turning the tables upon table turners – nor should I have done that but that so many enquiries poured in upon me that I thought it better to stop the inpouring flood by letting all know at once what my views and thoughts were. What a weak credulous, incredulous, unbelieving superstitious, bold, frightened, what a ridiculous world ours is, as far as concerns the mind of man. How full of inconsistencies, contradictions and absurdities it is. I declare that taking the average of many minds that have recently come before me (and apart from that spirit which God has placed in each) and accepting for a moment that average as a standard, I should far prefer the obedience affections and instinct of a dog before it. Do not whisper this however to others. There is one above who worketh in all things and who governs even in the midst of that misrule to which the tendencies and powers of man are so easily perverted.

I have far more confidence in the one man who works mentally and bodily at a matter than in the six who merely talk about it — and I therefore hope and am fully persuaded that you are working. Nature is our kindest friend and best critic in experimental science if we only allow her intimations to fall unbiased on our minds. Nothing is so good as an experiment which, whilst it sets an error right, gives us (as a reward for our humility in being reproved) an absolute advancement in knowledge.

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As when on some secluded branch in forest far and wide sits perched an owl, who, full of self-conceit and self-created wisdom, explains, comments, condemns, ordains and order things not understood, yet full of importance still holds forth to stocks and stones around — so sits and scribbles Mike.

I will simply express my strong belief, that that point of self-education which consists in teaching the mind to resist its desires and inclinations, until they are proved to be right, is the most important of all, not only in things of natural philosophy, but in every department of daily life.

Bacon in his instruction tells us that the scientific student ought not to be as the ant, who gathers merely, nor as the spider who spins from her own bowels, but rather as the bee who both gathers and produces. All this is true of the teaching afforded by any part of physical science. Electricity is often called wonderful, beautiful; but it is so only in common with the other forces of nature. The beauty of electricity or of any other force is not that the power is mysterious, and unexpected, touching every sense at unawares in turn, but that it is under law, and that the taught intellect can even now govern it largely. The human mind is placed above, and not beneath it, and it is in such a point of view that the mental education afforded by science is rendered super-eminent in dignity, in practical application and utility; for by enabling the mind to apply the natural power through law, it conveys the gifts of God to man.

A man who makes assertions, or draws conclusions, regarding any given case, ought to be competent to investigate it. He has no right to throw the onus on others, declaring it their duly to prove him right or wrong. His duty is to demonstrate the truth of that which he asserts, or to cease from asserting. The men he calls upon to consider and judge have enough to do with themselves, in the examination, correction, or verification of their own views. The world little knows how many of the thoughts and theories which have passed through the mind of a scientific investigator have been crushed in silence and secrecy by his own severe criticism and adverse examination; that in the most successful instances not a tenth of the suggestions, the hopes, the wishes, the preliminary conclusions have been realized.

Studiando, noi diventiamo tutti filosofi; dovrete dunque avvezzarvi, ogni volta che un risultato vi sorprende, specialmente quando questo risultato vi par nuovo, dovrete avvezzarvi, dico, a chiedere a voi stessi o ad altri: «Quale è la causa di ciò? Perché le cose succedono a questo modo?» E presto o tardi finirete sempre col trovare la risposta.

No matter what you look at, if you look at it closely enough, you are involved in the entire universe.

"I was at first almost frightened when I saw such mathematical force made to bear upon the subject, and then wondered to see that the subject stood it so well.
[Letter to James Clerk Maxwell, 25 March 1857, commenting on Maxwell's paper titled "On Faraday's Lines of Force"]"

The five essential entrepreneurial skills for success are concentration, discrimination, organization, innovation, and communication

Whereas, according to the declaration of that true man of the world Talleyrand, the use of language is to conceal the thoughts; this is to declare in the present instance, when I say I am not able to bear much talking, it means really, and without any mistake, or equivocation, or oblique meaning, or implication, or subterfuge, or omission, that I am not able; being at present rather weak in the head, and able to work no more.