“ Order is a necessary condition for anything the human mind is to understand. 秩序是任何人类头脑能够理解的事物的必要条件。 Rudolf Arnheim 鲁道夫·阿恩海姆
“ Neither comprehension nor learning can take place in an atmosphere of anxiety. 理解和学习都不能在焦虑的气氛中进行。 Rose Kennedy 罗斯·肯尼迪
“ An approximate answer to the right problem is worth a good deal more than an exact answer to an approximate problem. 正确问题的近似答案比近似问题的精确答案更有价值。 John Tukey 图基