Let us begin, then, at once, with that merest of words, “Infinity.” … It stands for the possible attempt at an impossible conception.

[Y]ou can easily understand how restrictions so absurd on their very face must have operated, in those days, to retard the progress of true Science, which makes its most important advances — as all History will show — by seemingly intuitive leaps.

[B]y the term “Universe,” … I mean to designate the utmost conceivable expanse of space, with all things, spiritual and material, that can be imagined to exist within the compass of that expanse.