What does he who learns but does not think is lost mean?

The phrase "he who learns but does not think is lost" suggests that acquiring knowledge without critical thinking and reflection can lead to confusion or misdirection. Learning alone is insufficient; one must also analyze, synthesize, and apply that knowledge to make sense of it. Without thoughtful engagement, information becomes meaningless or misapplied, resulting in a lack of true understanding. Ultimately, this highlights the importance of combining knowledge with deep thinking for personal growth and clarity.