That which enters the mind through reason can be corrected. That which is admitted through faith, hardly ever..

In adult centers the nerve paths are something fixed, ended, immutable. Everything may die, nothing may be regenerated..

It is notorious that the desire to live increases as life itself shortens..

Buffon said unreservedly, "Genius is simply patience carried to the extreme." To those who asked how he achieved fame he replied: "By spending forty ….

In the study of this membrane [the retina] I for the first time felt my faith in Darwinism (hypothesis of natural selection) weakened, being amazed a….

Nothing inspires more reverence and awe in me than an old man who knows how to change his mind..

Physical pain is easily forgotten, but a moral chagrin lasts indefinitely..

To know the brain...is equivalent to ascertaining the material course of thought and will, to discovering the intimate history of life in its perpetu….

I would be the last to deny that the greatest scientific pioneers belonged to an aristocracy of the spirit and were exceptionally intelligent, someth….

Intellectual work is an act of creation. It is as if the mental image that is studied over a period of time were to sprout appendages like an ameba—o….

In my own view, some advice about what should be known, about what technical education should be acquired, about the intense motivation needed to suc….

If a photographic plate under the center of a lens focused on the heavens is exposed for hours, it comes to reveal stars so far away that even the mo….

There are no small problems. Problems that appear small are large problems that are not understood.

In summary, all great work is the fruit of patience and perseverance, combined with tenacious concentration on a subject over a period of months or y….

The brain is a world consisting of a number of unexplored continents and great stretches of unknown territory..

Unfortunately, nature seems unaware of our intellectual need for convenience and unity, and very often takes delight in complication and diversity..

Like the entomologist in search of colorful butterflies, my attention has chased in the gardens of the grey matter cells with delicate and elegant sh….

The worst part is not in making a mistake but in trying to justify it, instead of using it as a heaven-sent warning of our mindlessness or our ignora….

It is idle to dispute with old men. Their opinions, like their cranial sutures, are ossified..

Every man if he so desires becomes sculptor of his own brain..

Heroes and scholars represent the opposite extremes... The scholar struggles for the benefit of all humanity, sometimes to reduce physical effort, so….