“Ignorance means you didn’t have the necessary knowledge. A person can hardly be blamed for that. Stupidity is the result of knowing what to do but not acting upon that knowledge.”
Book Sometimes you win Sometimes you Learn
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John C. Maxwell 145
American author, speaker and pastor 1947Related quotes

““You can hardly blame them.”
“Assuming stupidity is an inherited trait, then no, I can’t.””
Source: Revelation Space (2000), Chapter 3 (p. 67).

the necessary and sufficient conditions for rational knowledge
Source: Great Islamic Encyclopedia website, 2016 https://www.cgie.org.ir/fa/news/154958

Biharul Anwar, Volume 1, Page 222
Shi'ite Hadith

Variant translation: The more we learn about the world, and the deeper our learning, the more conscious, clear, and well-defined will be our knowledge of what we do not know, our knowledge of our ignorance. The main source of our ignorance lies in the fact that our knowledge can only be finite, while our ignorance must necessarily be infinite.
Conjectures and Refutations: The Growth of Scientific Knowledge (1963)
Context: The more we learn about the world, and the deeper our learning, the more conscious, specific, and articulate will be our knowledge of what we do not know, our knowledge of our ignorance. For this, indeed, is the main source of our ignorance — the fact that our knowledge can be only finite, while our ignorance must necessarily be infinite.

Two Precepts of Charity (1273)
Sermons on the Ten Commandments (Collationes in decem praeceptes, c. 1273), Prologue (opening sentence)
Variant translation: Three things are necessary for the salvation of man: to know what he ought to believe; to know what he ought to desire; and to know what he ought to do.
Original: (la) Tria sunt homini necessaria ad salutem: scilicit scientia credendorum, scientia desiderandorum, et scientia operandorum.

1970's, Conversations with Samuel Beckett and Bram van Velde (1970 - 1972)