Learning without thought is labour lost; thought without learning is perilous.
[tr. Legge (1861)]

Learning with [sic] thought is a snare; thought without learning is a danger.
[tr. Jennings (1895)]

Study without thinking is labour lost. Thinking without study is perilous.
[tr. Ku Hung-Ming (1898)]

Learning without thought is useless. Thought without learning is dangerous.
[tr. Soothill (1910)]

Education without meditation is useless. Meditation without education is risky.
[tr. Soothill (1910), alternate]

Research without thought is a mere net and entanglement: thought without gathering data, a peril.
[tr. Pound (1933)]

He who learns but does not think, is lost. He who thinks but does not learn is in great danger.
[tr. Waley (1938)]

If one learns from others but does not think, one will be bewildered. If, on the other hand, one thinks but does not learn from others, one will be in peril.
[tr. Lau (1979)]

If one studies but does not think, one is caught in a trap. If one thinks but does not study, one is in peril.
[tr. Dawson (1993)]

To study without thinking is futile. To think without studying is dangerous.
[tr. Leys (1997)]

Learning without thinking is fruitless; thinking without learning is perplexing.
[tr. Huang (1997); additional translations.]

Studying but not thinking, it is confused; Thinking but not studying, it is dangerous.
[tr. Cai/Yu (1998)]

Learning without due reflection leads to perplexity; reflection without learning leads to perilous circumstances.
[tr. Ames/Rosemont (1998)]

If he studies and does not reflect, he will be rigid. If he reflects but does not study, he will be shaky.
[tr. Brooks/Brooks (1998)]

To learn and never think -- that's delusion. But to think and never learn -- that is perilous indeed!
[tr. Hinton (1998)]

If you learn without thinking about what you have learned, you will be lost. If you think without learning, however, you will fall into danger.
[tr. Slingerland (2003)]

Learning without thought is pointless. Thought without learning is dangerous.
[tr. Watson (2007)]

If you learn but do not think, you will be dazed. If you think but do not learn, you will be in danger.
[tr. Chin (2014)]

Learning from books without critical thinking results in confusion. Thinking vacuously without learning from books is perilous.
[tr. Li (2020)]