数学是概念之间关系的科学，与内容无关。
虽然无法改变过去，但可以改变未来。
"Success is great, but success with humility is even better."
Psychology must be a practical science, concerned with the how and why of mental operations.
Innovation is the lifeblood of any industry, and those who fail to adapt will be left behind.
Modern forestry must balance three axes: ecology, economy and ethics.