I remember when you'll be a month old, and I'll stumble out of bed to give you your 2:00 a.m. feeding.

Past and future are the same, and we cannot change either, onlyknow them more fully. My journey to the past had changednothing, but what I had learned had changed everything.

The ray of light has to know where it will ultimately end up before it can choose the direction to begin moving in""Fermat's principle sounds weird because it describes light's behavior in goal-oriented terms. It sounds like a commandment to a light beam: "Thou shalt minimize or maximize the time taken to reach thy destination.

The physical universe was a language with a perfectly ambiguous grammar. Every physical event was an utterance that could be parsed in two entirely different ways, one casual and the other teleological, both valid, neither one disqualifiable no matter how much context was available.