Leithen's story had bored and puzzled me at the start, but now it had somehow gripped my fancy. Space a domain of endless corridors and Presences moving in them! The world was not quite the same as an hour ago. It was the hour, as the French say, "between dog and wolf," when the mind is disposed to marvels.
John BuchanRelated topics
dog fancy french hour mind moving now quite space start story wolfRelated quotes
To start, we will consider a single particle moving in three space dimensions under the influence of a general central potential. Later we will specialize to the case of a Coulomb potential, and work out the spectrum of hydrogen. One other classic problem, the harmonic oscillator, will be treated at the end of this chapter.
Steven Weinberg
The process of philosophizing, to my mind, consists mainly in passing from those obvious, vague, ambiguous things, that we feel quite sure of, to something precise, clear, definite, which by reflection and analysis we find is involved in the vague thing that we start from, and is, so to speak, the real truth of which that vague thing is a sort of shadow.
Bertrand Russell