I don’t do this often but I did like this one:
A well-trained man knows how to answer questions; an educated man knows what questions are worth asking."
— E. Digby Baltzell (1955)
The article in the link also says:
Bell (Telephone), then one of the largest industrial concerns in the country (US), needed more employees capable of guiding the company rather than simply following instructions or responding to obvious crises.