A Quote by 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.
I am persuaded that this method [for calculating the volume of a sphere] will be of no little service to mathematics. For I foresee that once it is understood and established, it will be used to discover other theorems which have not yet occurred to me, by other mathematicians, now living or yet unborn.
It should be clear by now that a nation can be no stronger abroad than she is at home. Only an America which practices what it preaches about equal rights and social justice will be respected by those whose choice affects our future. Only an America which has fully educated its citizens is fully capable of tackling the complex problems and perceiving the hidden dangers of the world in which we live. And only an America which is growing and prospering economically can sustain the worldwide defenses of freedom, while demonstrating to all concerned the opportunities of our system and society.
Man is made for science; he reasons from effects to causes, and from causes to effects; but he does not always reason without error. In reasoning, therefore, from appearances which are particular, care must be taken how we generalize; we should be cautious not to attribute to nature, laws which may perhaps be only of our own invention.
[My Book] will endeavour to establish the principle[s] of reasoning in ... [geology]; and all my geology will come in as illustration of my views of those principles, and as evidence strengthening the system necessarily arising out of the admission of such principles, which... are neither more nor less than that no causes whatever have from the earliest time to which we can look back, to the present, ever acted, but those now acting; and that they never acted with different degrees of energy from that which they now exert.
I promise you this: at the end of your days, you will discover that the things you now perceive to be the big things in your life will be seen as little things, and all those things that you now believe to be the little things, you will realize were really the big things.
I can assure you that those villains will recognize, will discover in appropriate time in the future how stupid they are and how they are pretending things which have never taken place
The Soul which is approaching its' liberation, as it looks back over past lives... down the vistas of the centuries along which it has slowly been climbing,... is able to see there the way in which the bonds were made, the causes which set it in motion. It is able to see how many of those causes have worked themselves out and... how many... are still working themselves out.
All in all this is a difficult political struggle which will go on for years, in which our people won't die anymore; I'm not sure how much we will be able to win, but I'm certain that we won't loose anything that we have now.
Let us treasure up in our soul some of those things which are permanent..., not of those which will forsake us and be destroyed, and which only tickle our senses for a little while.
For unless one is able to live fully in the present, the future is a hoax. There is no point whatever in making plans for a future which you will never be able to enjoy. When your plans mature, you will still be living for some other future beyond. You will never, never be able to sit back with full contentment and say, "Now, I've arrived!" Your entire education has deprived you of this capacity because it was preparing you for the future, instead of showing you how to be alive now.
The time will come when diligent research over periods will bring to light things which now lie hidden...Many discoveries are reserved for ages still to come, when memories of us will have been effaced. Our universe is a sorry little affair unless it has something for every age to investigate. nature does not reveal her mysteries once and for all.
The photographer sees the world as a child sees the bits of glass in a kaleidoscope. If he has a camera with which he can secure these ever-changing combinations, he is then able to look on them again and again, and he has the further pleasure of pleasing others with the sight of things which he, with perhaps unusual opportunities, was able to see, which his friends would otherwise not ever be able to.
Observe and contemplate on the hidden things of life: how a man's seed is but the beginning, it takes others to bring it to fruition. Think how food undergoes such changes to produce health and strength. See the power of these hidden things which, like the wind cannot been seen, but its effects can be.
By what criterion... can we distinguish among the numberless effects, that are also causes, and among the causes that may, for aught we can know, be also effects, - how can we distinguish which are the means and which are the ends?
It is indeed a matter of great difficulty to discover, and effectually to distinguish, the true motions of particular bodies from the apparent; because the parts of that immovable space, in which those motions are performed, do by no means come under the observation of our senses. Yet the thing is not altogether desperate; for we have some arguments to guide us, partly from the apparent motions, which are the differences of the true motions; partly from the forces, which are the causes and effects of the true motions.
True Christianity, which will last forever, comes from the gospel words of Christ not from the epistles of Paul. The writings of Paul have been a danger and a hidden rock, the causes of the principal defects of Christian theology.
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