John Locke (1632–1704), British empiricist philosopherWikimedia Commons (commons.wikimedia.org)
All Men are liable to Error; and most Men are, in many Points, by Passion or Interest, under Temptation to it.
JOHN LOCKE , AN ESSAY CONCERNINGHUMAN UNDERSTANDING
... the two operations of our understanding, intuition and deduction, on which alone we have said we must rely in the acquisition of knowledge.
RENÉ DESCARTES , RULES FORTHE DIRECTION OF THE MIND
Can I, by sufficient thought alone, design a complex object correctly? This question, particularized to design, ...