This dictum has become known as "Hitchens's razor", who died on this day nine years ago. The dictum appears in Hitchens's book titled "God Is Not Great: How Religion Poisons Every-thing", in which he makes a case against organized religion.
If you, like me, have no need to gather every day, or every seven days, or on any high and auspicious day, to proclaim your rectitude or to grovel and wallow in your unworthiness, you will have saved plenty of time to read this truly amazing book. Buy it or read it online at www.archive.org (SIGN UP - it's free! - then LOG IN and BORROW).
There's been nothing as erudite and witty since Bertrand Russell's "Why I Am Not A Christian"!