The ridiculous subject was both mind stimulating and enjoyable.
Their tone is stimulating and lofty.
They should be planted in good soil, but not of too stimulating a character.
Emerson's verdict upon a greater thinker - that his was " not a mind to nestle in " - may be true of Herbart, but there can be no doubt as to the stimulating force of this master.
Harnack, both as lecturer and writer, was one of the most prolific and most stimulating of modern critical scholars, and trained up in his "Seminar" a whole generation of teachers, who carried his ideas and methods throughout the whole of Germany and even beyond its borders.