A Quote by Leonardo da Vinci

Although nature commences with reason and ends in experience it is necessary for us to do the opposite, that is to commence with experience and from this to proceed to investigate the reason.
To consider the matter aright, reason is nothing but a wonderful and unintelligible instinct in our souls, which carries us along a certain train of ideas, and endows them with particular qualities, according to their particular situations and relations. This instinct, 'tis true, arises from past observation and experience; but can anyone give the ultimate reason, why past experience and observation produces such an effect, any more than why nature alone should produce it?
Experience alone cannot deliver to us necessary truths; truths completely demonstrated by reason. Its conclusions are particular, not universal.
So let's set the record straight. Faith is not the opposite of reason. The opposite of faith is unbelief. And reason is not the opposite of faith. The opposite of reason is irrationality. Do some Christians have irrational faith? Sure. Do some skeptics have unreasonable unbelief? You bet. It works both ways.
I hold that the mark of a genuine idea is that its possibility can be proved, either a priori by conceiving its cause or reason, or a posteriori when experience teaches us that it is in fact in nature.
There's a reason that students don't grade their own papers. There's a reason defendants don't sentence themselves. And there's the reason the State Department doesn't get to investigate itself, determine whether or not it made errors in Benghazi. That is Congress's job.
You see, gentlemen, reason is an excellent thing, there’s no disputing that, but reason is nothing but reason and satisfies only the rational side of man’s nature, while will is a manifestation of the whole life, that is, of the whole human life including reason and all the impulses. And although our life, in this manifestation of it, is often worthless, yet it is life and not simply extracting square roots.
In our culture, imitation-based experience dominates reality-based experience. I find this an awful thing. But there are artists who know from the bottom of their souls that art is about the experience of reality. The reason we have art is because you can’t get a real experience from the world.
My advice to those who which to learn the art of scientific prophesy is not to rely on abstract reason, but to decipher the secret language of Nature from Nature's documents: the facts of experience.
In my experience, you get a job for a reason. Your work life happens for a reason.
I have to experience all the ghastly, bottomless depths for life for myself; it's for that reason that I went to war, and for that reason I volunteered.
Certainly Christianity is an experience, but equally clearly the validity of ane experience has to be tested. There are people in lunatic asylums who have the experience of being the Emperor Napoleon or a poached egg. It is unquestionably an experience, and to them a real experience, but for all that it has no kind of universal validity. It is necessary to go far beyond simply saying that something comes from experience. Before any such thing can be evaluated at all, the source and character of the experience must clearly be investigated.
Law is experience developed by reason and applied continually to further experience.
Like Aristotle, conservatives generally accept the world as it is; they distrust the politics of abstract reason – that is, reason divorced from experience.
Although it is true that by fate all things are forced and linked by a necessary and dominant reason, nevertheless the character of our minds is subject to fate in a manner corresponding to their nature and quality.
there are times when life's ends are so raveled that reason and sense cry out that we stop and gather them together again before we can proceed
For authority proceeds from true reason, but reason certainly does not proceed from authority. For every authority which is not upheld by true reason is seen to be weak, whereas true reason is kept firm and immutable by her own powers and does not require to be confirmed by the assent of any authority.
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