What I see in Nature is a magnificent structure that we can comprehend only very imperfectly, and that must fill a thinking person with a feeling of humility. This is a genuinely religious feeling that has nothing to do with mysticism.

I learned to observe the world around me, and to note what I saw

It is beautiful here [in , Normandy], my friend; every day I discover even more beautiful things. It is intoxicating me, and I want to paint it all - my head is bursting.. ..I want to fight, scratch it off, start again, because I start to see and understand. I seems to me as if I can see nature and I can catch it all.. ..it is by observation and reflection that I discover how. That is what we are working on, continuously..

When you discover something or observe something for the first time, you... wonder how that works, and then you make one, and you look at it, and you decide you'd better find out how it works. ...[Y]ou set about a detailed series of experiments, and eventually, ...you have to do the sums, it wouldn't be respectable without doing the sums... [Y]ou do the sums and then you publish it as a paper in the learned society journal. ...[Y]ou write it as if it was done from the front, as if on morning one you said "I will now invent the magnetic river..." ...[T]his very unfortunate phrase keeps coming in, "Now it is cleat that..." and "Clearly, obviously..." None of it is obvious. It wasn't the day before you started. No, you do it from the back.

We cannot observe external things without some degree of Thought; nor can we reflect upon our Thoughts, without being influenced in the course of our reflection by the Things which we have observed.

The more you observe nature, the more you perceive that there is tremendous organization in all things. It is an intelligence so great that just by observing natural phenomena I come to the conclusion that a Creator exists.

And muse on Nature with a poet's eye.

"When describing nature, a writer should seize upon small details, arranging them so that the reader will see an image in his mind after he closes his eyes. For instance: you will capture the truth of a moonlit night if you'll write that a gleam like starlight shone from the pieces of a broken bottle, and then the dark, plump shadow of a dog or wolf appeared. You will bring life to nature only if you don't shrink from similes that liken its activities to those of humankind."

(Letter to Alexander Chekhov, May 10, 1886)

Even when we look at nature, our imagination constructs the picture. (1 September 1859)

Discovery consists of looking at the same thing as everyone else and thinking something different.

It is when one is alone that one begins to observe Nature and to love her.

I have before now experienced that the best way to get a vivid impression and feeling of a landscape is to sit down before it and read, or become otherwise absorbed in thought; for then, when our eyes happen to be attracted to the landscape, you seem to catch Nature at unawares, and see her before she has time to change her aspect. The effect lasts but for a single instant, and passes away almost as soon as you are conscious of it; but it is real for that moment. It is as if you could overhear and understand what the trees are whispering to one another; as if you caught a glimpse of a face unveiled, which veils itself from every willful glance. The mystery is revealed, and, after a breath or two, becomes just as much a mystery as before.

We have to remember that what we observe is not nature in itself but
nature exposed to our method of questioning.

The natural world seems a marvel of complexity, requiring a vastly intricate intelligence to create and govern it, just because we have represented it to ourselves in the clumsy 'notation' of thought.
[...] Understanding nature by means of thought is like trying to make out the contours of an enormous cave with the aid of a small flashlight casting a bright but very thin beam. The path of the light and the series of 'spots' over which it has passed must be retained in memory, and from this record the general appearance of the cave must laboriously be reconstructed.