“It is not necessary to ask whether soul and body are one, just as it is not necessary to ask whether the wax and its shape are one, nor generally whether the matter of each thing and that of which it is the matter are one. For even if one and being are spoken of in several ways, what is properly so spoken of is the actuality.”
De Anima ii 1, 412b6–9: About the Mind–body problem
De Anima
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Aristotle 230
Classical Greek philosopher, student of Plato and founder o… -384–-321 BCRelated quotes

Source: Better-World Philosophy: A Sociological Synthesis (1899), The Social Ideal, pp. 157–158

Variant:
The existence of law is one thing; its merit or demerit is another. Whether it be or be not is one enquiry; whether it be or be not conformable to an assumed standard, is a different enquiry. A law, which actually exists, is a law, though we happen to dislike it, or though it vary from the text, by which we regulate our approbation and disapprobation.
John Austin, Austin Lectures on Jurisprudence; or The Philosophy of Positive Law, 1873, Lecture V
Source: The Province of Jurisprudence Determined (1832), p. 278

Reverence for Life (1969)
Context: I do not want to frighten you by telling you about the temptations life will bring. Anyone who is healthy in spirit will overcome them. But there is something I want you to realize. It does not matter so much what you do. What matters is whether your soul is harmed by what you do. If your soul is harmed, something irreparable happens, the extent of which you won't realize until it will be too late.

““Do you believe that?” I asked.
“It doesn’t matter whether I believe it or not,” Redhouse said.”
Source: Lock In (2014), Chapter 10 (p. 135)

If it does matter, then you must justify your beliefs; if it doesn’t, then you must justify belief itself.
Source: Faith vs. Fact (2015), p. 63

Source: Productive thinking, 1945, p. 62

“It gets tiresome being spoken to as if you are a child, even if you happen to be one.”
Source: The Name of the Wind