No amount of learning from books or of listening to the words of authority can be substituted for the spade-work of investigation.


Discovery; or, The Spirit and Service of Science, Chapter III (p. 42), Macmillan & Company Ltd. 1918


No amount of learning from books or of listening to the words of authority can be substituted for the spade-work of investigation.

No amount of learning from books or of listening to the words of authority can be substituted for the spade-work of investigation.

No amount of learning from books or of listening to the words of authority can be substituted for the spade-work of investigation.

No amount of learning from books or of listening to the words of authority can be substituted for the spade-work of investigation.