科学是人类理解和改造世界的最有力工具。
Science is the most powerful tool for human beings to understand and transform the world.
与我们内心的东西相比，我们身后和面前的东西都是微不足道的。
Data without insight is just noise.
The teacher is not in school to impose certain ideas or to form certain habits in the child, but is there as a member of the community to select the influences which shall affect the child and to assist him in properly responding to those influences.
There are tracts in my life that are bare and silent. They are the open spaces where my busy days had their light and air.