不愤不启，不悱不发；举一隅不以三隅反，则不复也。
【讲解】：（教学生）不到他苦思冥想怎么也弄不明白的时候，不去开导他；不到他想说而又说不出来的时候，不去启发他。告诉他（四方形）的一个角，他不能由此推出另外三个角，就不再往下教他（新知识）了。
"Life is a journey that must be traveled no matter how bad the roads and accommodations."
Sustainability isn't just a trend; it's the future of leather tanning.
I don't make music for the critics, I make it for the people.
The greatest threat to our forests is not logging, but indifference.
The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion.