We must be vigilant and resolutely fight against all enemies, both internal and external.
我们必须保持警惕，坚决与一切内外敌人作斗争。
To every action there is always opposed an equal reaction； or， the mutual actions of two bodies upon each other are always equal， and directed to contrary parts.
The only way to do great work is to love what you do.
在静谧中找到内心的宁静。