Build a better mousetrap and the world will beat a path to your door.

To wade in marshes and sea margins is the destiny of certain bird, and they are so accurately made for this that they are imprisoned in those places. Each animal out of its habitat would starve. To the physician, each man, each woman, is an amplification of one organ. A soldier, a locksmith, a bank-clerk, and a dancer could not exchange functions. And thus we are victims of adaptation.

There are some men above grief and some men below it.

To laugh often and much ... this is to have succeeded. Probably not from Emerson: here's the full quotation and the story.

Every experiment, by multitudes or by individuals, that has a sensual and selfish aim, will fail.

Genius is always sufficiently the enemy of genius by over influence. The literature of every nation bear me witness. The English dramatic poets have Shakspearized now for two hundred years.

When there is no vision, people perish.