我不是没素材了,我只是没时间了。
释义:不考虑在安逸的环境中要想到危难,用节俭来戒除奢侈,不使自己的道德处于深厚的境界,不能使自己的情欲战胜物质欲望,这就像砍伐树木的根却想要树木长得茂盛,堵塞水的源头却想要水流得长远一样荒谬。 
The more you learn, the more you know. The more you know, the more you forget. The more you forget, the less you know. So why bother to learn?