Excerpt from The Principles of Science: A Treatise on Logic and Scientific Method
All knowledge proceeds originally from experience. Using the name in a wide sense we may say that experience comprehends all that we feel, externally or internally - the aggregate of the impressions which we receive through the various apertures of perception - the aggregate consequently of what is in the mind, except so far as some portions of knowledge may be the reasoned equivalents of other portions. As the word experience implies, we go through much in life, and the impressions gathered intentionally or unintentionally afford the materials from which the active powers of the mind evolve science.
No small part of the experience actually employed in science is acquired without any distinct purpose. We cannot use the eyes without gathering some facts which may prove useful. Every great branch of science has generally taken its first rise from an accidental observation.
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