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" A man has always to be busy with his thoughts if anything is to be accomplished. "

Antonie van Leeuwenhoek

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" For my part, I would say that the male sperm and seeds of plants have been penetrated so far that there is nothing further to discover in this great secret, but I could err in my opinion. "

Antonie van Leeuwenhoek

" How little do we discover in comparison of those things which now are and forever will be hidden from our sight? The whole of which I am fully persuaded no one will ever be able to dive into, and to explain their causes and effects. "

Antonie van Leeuwenhoek

" No one can pretend to say that a fish is ever killed by heat, for many kinds of fish, in the middle of summer, and in the burning heat of the sun, do either play, as it were, on the surface of the water, or hide themselves under the leaves, weeds, or other substances at the bottom. "

Antonie van Leeuwenhoek

" Please bear in mind that my observations and thoughts are the outcome of my own unaided impulse and curiosity alone; for, besides myself, in our town there be no philosophers who practice this art, so pray, take not amiss my poor pen and the liberty I here take in setting down my random notions. "

Antonie van Leeuwenhoek

" I've never taught one, because if I taught one, I'd have to teach others... I would give myself over to a slavery, whereas I want to stay a free man. "

Antonie van Leeuwenhoek

" When I have supped too heavily of an evening, I drink in the morning a large number of cups of coffee, and that as hot as I can drink it, so that the sweat breaks out on me, and if by so doing I can't restore my body, a whole apothecary's shop couldn't do much, and that is the only thing I have done for years when I have felt a fever. "

Antonie van Leeuwenhoek

" I have often endeavoured to view the circulation of the blood in terrestrial animals, but without success, by reason that no parts of their bodies were sufficiently transparent. "

Antonie van Leeuwenhoek

" I now found that the spider cannot fix its thread to anything without imprinting the hind part of its body on the place, by which pressure it emits an incredible number of excessively small threads diverging in every direction from whence we may conclude that as soon as the threads are exposed to the air, they lose their viscosity or gluey quality. "

Antonie van Leeuwenhoek

" Man comes not from an egg but from an animalcule that is found in male sperm. "

Antonie van Leeuwenhoek

" I have oft-times been besought, by divers gentlemen, to set down on paper what I have beheld through my newly invented microscopia, but I have generally declined. "

Antonie van Leeuwenhoek

" Life lives on life - it is cruel, but it is God's will. And it is for our good, of course, because if there weren't little animals to eat up the young mussels, our canals would be choked by those shellfish, for each mother has more than a thousand young ones at a time! "

Antonie van Leeuwenhoek

" How inscrutable and incomprehensible are the hidden works of Nature! "

Antonie van Leeuwenhoek

" I must confess... I don't know any tongue but the Nether-Dutch. "

Antonie van Leeuwenhoek

" Whenever I found out anything remarkable, I have thought it my duty to put down my discovery on paper, so that all ingenious people might be informed thereof. "

Antonie van Leeuwenhoek

" My determination is not to remain stubbornly with my ideas, but I'll leave them and go over to others as soon as I am shown plausible reasons which I can grasp. "

Antonie van Leeuwenhoek

" We will admit that, out of the mud or sand which is found on the seashore or the beds of our rivers, at low water, shellfish or testaceous animals come forth, but it does not from thence by any means follow that they are produced without any regular course of generation. "

Antonie van Leeuwenhoek

" Just as the supposed number may differ from the true number by fully 100, 150, or even 200 in a flock of 600 sheep, so may I be even more out of my reckoning in the case of these very little animalcules. "

Antonie van Leeuwenhoek

" I have lately examined water, in which beaten pepper was steeped, and found two sorts of animals for shape, and each of those sorts to contain greater and smaller kinds: the greater I supposed the elder, the less the younger. "

Antonie van Leeuwenhoek

" For my part, I hold it equally impossible for a small shellfish to be produced without generation as for a whale to have its origin from the mud. "

Antonie van Leeuwenhoek

" In rain water, I observed a small red worm and two other kinds of very minute insects; of those of the larger size, I judged that 30,000 together would not equal a coarse sand. "

Antonie van Leeuwenhoek

" If any person examines by the microscope that part towards the extremity of the spider's body from whence its thread proceeds, he will observe the spot to be, as it were, surrounded by five several protuberances or risings, each ending in a point and altogether forming a kind of enclosure. "

Antonie van Leeuwenhoek

" In treating of the oak, I have considered that the species of it growing in warm climates is superior to that which is produced in cold countries. But we must not imagine this to be the case with all woods; on the contrary, the fir timber grown in cold countries is superior to that produced in warm ones, where its growth is rapid. "

Antonie van Leeuwenhoek

" People who look for the first time through a microscope say, 'Now I see this, and then I see that,' and even a skilled observer can be fooled. On these observations I have spent more time than many will believe, but I have done them with joy, and I have taken no notice of those who have said, 'Why take so much trouble,' and, 'What good is it?' "

Antonie van Leeuwenhoek