"We must recognize variations in thinking not as changes in yesterday's truth which convert it into today's error, but as changes in man's orientation which lead him to see other truths that are different from those of yesterday. It is not truths that change, but man who changes and who, because he changes, goes on scanning the series of truths, goes on choosing from that transmundane sphere...the ones that are right for him, and blinding himself to all the rest. Note that this is history's basic and fundamental a priori. Is it not the history of man? ....For very concrete reasons, I hope that in our age the curiosity about the eternal and invariable which is philosophy and the curiosity about the inconstant and changing which is history may come together and embrace."
- Jose Ortega y Gassett