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If we are not rethinking we are not learning.
By definition, learning does not mean to acquire information.
Learning means to mature in understandings.
Therefore, as understandings change, what we have previously thought on various subjects should also change.
Rethinking is the automatic conclusion in a learning process and the automatic catalyst for the next.
Learning and rethinking is a self-fulfilling process.
Therefore, once learning begins, it is not possible to stop learning unless what we're learning is how to stop thinking.