Electricity is of two kinds, ...

Electricity is of two kinds, positive and negative. The difference is, I presume, that one comes a little more expensive, but is more durable; the other is a cheaper thing, but the moths get into it.
 Stephen Leacock

Quotes from the same author

What we call creative work, ought not to be called work at all, because it isn't. I imagine that Thomas Edison never did a day's work in his last fifty years.
 Stephen Leacock
Men are able to trust one another, knowing the exact degree of dishonesty they are entitled to expect.
 Stephen Leacock
You frequently ask, where are the friends of your childhood, and urge that they shall be brought back to you. As far as I am able to learn, those of your friends who are not in jail are still right there in your native village. You point out that they were wont to share your gambols, If so, you are certainly entitled to have theirs now.
 Stephen Leacock
How strange it is, our little procession of life! The child says, "When I am a big boy." But what is that? The big boy says, "When I grow up." And then, grown up, he says, "When I get married." But to be married, what is that after all? The thought changes to "When I'm able to retire." And then, when retirement comes, he looks back over the landscape traversed; a cold wind seems to sweep over it; somehow he has missed it all, and it is gone.
 Stephen Leacock
It was Einstein who made the real trouble. He announced in 1905 that there was no such thing as absolute rest. After that there never was.
 Stephen Leacock