2. The past and future are equally real.
過去與未來都是真實的。

This isn't completely accepted, but it should be. Intuitively we think that the "now" is real, while the past is fixed and in the books, and the future hasn't yet occurred. But physics teaches us something remarkable: every event in the past and future is implicit in the current moment. This is hard to see in our everyday lives, since we're nowhere close to knowing everything about the universe at any moment, nor will we ever be — but the equations don't lie. As Einstein put it, "It appears therefore more natural to think of physical reality as a four dimensional existence, instead of, as hitherto, the evolution of a three dimensional existence."
并不是所有人都接受這個觀點，但是大家應該接受。憑直覺，我們認為“現在”是真實的，“過去”只存在于書中，而“未來”尚未發生。但物理學告訴我們一個驚人的事實：過去與未來的每一刻都存在于當下。在我們的日常生活中要理解這一點很難，因為我們無從知曉宇宙中每一刻所發生的全部事件——但是數學方程可不會說謊。就像愛因斯坦說的：“長久以來，我們都把物質世界看成是一個不斷發展的三維存在，但將它看成一個四維存在似乎更為自然一些。”