Philosophy as Rigorous Science and Political Philosophy (1971)
“As all our knowledge of the material world is derived from the information of our senses, natural philosophers have, in modern times, wisely abandoned to metaphysicians, all speculations concerning the nature of that substance of which it is composed; concerning the possibility or impossibility of its being created; concerning the efficient causes of the changes which take place in it; and even concerning the reality of its existence, independent of that of percipient beings: and have confined themselves to the humbler province of observing the phenomena it exhibits, and of ascertaining their general laws.”
Source: Elements of the Philosophy of the Human Mind, 1792, p. 12
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Dugald Stewart 6
Scottish philosopher and mathematician 1753–1828Related quotes
Source: Anti-Intellectualism in American Life (1974), p. 29

Source: A New Critique of Theoretical Thought, Volume I: The Necessary Presuppositions of Philosophy (trans. William S. Young and David H. Freeman), p. 4 ( full context http://www.dbnl.org/tekst/dooy002newc05_01/dooy002newc05_01_0004.php#4)

“Our Business here is not to know all things, but those which concern our conduct.”
Source: An Essay Concerning Human Understanding 2

Systematic Theology (1951–63)
Context: The question now arises: What is the content of our ultimate concern? What does concern us unconditionally? The answer, obviously, cannot be a special object, not even God, for the first criterion of theology must remain formal and general. If more is to be said about the nature of our ultimate concern, it must be derived from an analysis of the concept “ultimate concern.” Our ultimate concern is that which determines our being or not-being. Only those statements are theological which deal with their object in so far as it can become a matter of being or not-being for us.

2012, Remarks at Clinton Global Initiative (September 2012)
Context: As Bill mentioned, I’ve come to CGI every year that I’ve been President, and I’ve talked with you about how we need to sustain the economic recovery, how we need to create more jobs. I’ve talked about the importance of development -- from global health to our fight against HIV/AIDS to the growth that lifts nations to prosperity. We've talked about development and how it has to include women and girls -- because by every benchmark, nations that educate their women and girls end up being more successful. And today, I want to discuss an issue that relates to each of these challenges. It ought to concern every person, because it is a debasement of our common humanity. It ought to concern every community, because it tears at our social fabric. It ought to concern every business, because it distorts markets. It ought to concern every nation, because it endangers public health and fuels violence and organized crime. I’m talking about the injustice, the outrage, of human trafficking, which must be called by its true name -- modern slavery.