HERMANN VON HELMHOLTZ 



such a man is perhaps the most interesting thing 

 which life may have to offer.' 



2. Freedom. ' There is here for feeble characters a 

 gift as calamitous as it is precious for the strong. . . . 

 But the state and the nation have more to expect from 

 those who are capable of supporting liberty, and whose 

 efforts and work are the results of their own individual 

 energy, of their dominion over themselves, and their 

 love of science.' 



3. Professorial Fitness. c The doing something for 

 the progress of science is the best mark of a man's 

 fitness to educate.' 



4. Use of Lectures. c A good exposition demands 

 from the listener much less sustained effort than a bad 

 one ; it enables the subject to be comprehended much 

 more surely and much more completely, and with a 

 well-ordered arrangement, bringing into strong relief 

 the principal points and the divisions, much more can 

 be overtaken in the same space of time.' 



5. Teachers. * He who wishes to inspire his 

 audience with a complete conviction of the truth of 

 what he advances, ought, above all, to know from 

 personal experience what produces conviction. It is 

 necessary, then, that he should have known how to 

 advance alone into a region where no one has ever 

 broken ground ; in other words, he must have worked 

 upon the frontiers of human science and conquered for 

 himself new domains. A master who presents only 

 results acquired by others, suffices for scholars to whom 



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