Contemplation is a means of elevating the soul; through contemplation, humanity can gain a deeper understanding of the mysteries of the cosmos.

You have to believe in yourself when no one else does.

教师必须具有健康的体魄，农人的身手，科学的头脑，艺术的兴味，改革社会的精神。

化学之美在于它能解释看不见的事物。