the greatest part of men, having much to do to get the means of living, are not in a condition to look after those of learned and laborious inquiries.
 John Locke, An Essay Concerning Human Understanding (1689). copy citation

Context

“So that a great part of mankind are, by the natural and unalterable state of things in this world, and the constitution of human affairs, unavoidably given over to invincible ignorance of those proofs on which others build, and which are necessary to establish those opinions: the greatest part of men, having much to do to get the means of living, are not in a condition to look after those of learned and laborious inquiries. 3. Objection, What shall become of those who want Proofs? Answered. What shall we say, then? Are the greatest part of mankind, by the necessity of their condition, subjected to unavoidable ignorance, in those things which are of greatest importance to them?” source