The day science begins to study non-physical phenomena, it will make more progress in one decade than in all the previous centuries of its existence.
When one wants to study men, one must consider those around one. But to study man, one must extend the range of one’s vision. One must first observe the differences in order to discover the properties.[Quand on veut étudier les hommes il faut regarder près de soi; mais pour étudier lʼhomme il faut apprendre à porter sa vue au loin; il faut dʼabord observer les différences pour découvrir les propriétés.]
Study and in general the pursuit of truth and beauty is a sphere of activity in which we are permitted to remain children all our lives.
Just as food eaten without appetite is a tedious nourishment, so does study without zeal damage the memory by not assimilating what it absorbs.