如果物体处于静止状态或作匀速直线运动，只要没有外力作用，物体将保持静止状态或匀速直线运动状态。
Every body continues in its state of rest, or of uniform motion in a right line, unless it is compelled to change that state by forces impressed upon it.
这种我们能创造一个每个人的能力都忠实地被分级，好的就到顶端，坏的就到底部，而且保证过程毫无差错，这是不可能的。这世上有太多偶然的契机，不同的机运，出身，疾病，从天而降的意外等等，我们却无法将这些因素分级，无法完全忠实的将人分级。
To live is to choose, and to choose is to renounce.
Life is about making mistakes and learning from them. That's how you grow.