Leadership is about making tough decisions today that will benefit future generations.

The end of history will be a very sad time. The struggle for recognition, the willingness to risk one's life for a purely abstract goal, the worldwide ideological struggle that called forth daring, courage, imagination, and idealism, will be replaced by economic calculation, the endless solving of technical problems, environmental concerns, and the satisfaction of sophisticated consumer demands.

I don't think about the past. The only thing that matters is the future.

物体的加速度与所受的合外力成正比，与物体的质量成反比。加速度的方向与合力的方向相同。

You have to trust your instincts.