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Posted on the occasion of Pi Day, and with prayer for the souls of Albert Einstein (b. 14 March 1879) and Stephen Hawking (d. 14 March 2018). For other legally free ebooks, you may access the List of Free eBooks (Arranged by Title) and the List of Free eBooks (Grouped by Subject).

[T]hat which is known of God is manifest in them. For God hath manifested it to them. For the invisible things of him, from the creation of the world, are clearly seen, being understood by the things that are made: his eternal power also and divinity” (Romans i, 19-20)

“The perpetual agreement of the Catholic Church has maintained and maintains… that there is a twofold order of knowledge, distinct not only as regards its source, but also as regards its object… With regard to the source, we know at the one level by natural reason, at the other level by divine faith…

“Even though faith is above reason, there can never be any real disagreement between faith and reason, since it is the same God who reveals the mysteries and infuses faith, and who has endowed the human mind with the light of reason… God cannot deny himself, nor can truth ever be in opposition to truth…” (First Vatican Council, Session III, Dogmatic Constitution on the Catholic Faith “Dei Filius”, chap. iv, 1-2, 5-6)