Men imagine that they communicate their virtue or vice only by overt actions, and do not see that virtue or vice emit a breath every moment.

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

But speak the truth, and all nature and all spirits help you with unexpected furtherance. Speak the truth, and all things alive orbrute are vouchers, and the very roots of the grass underground there do seem to stir and move to bear you witness.

Nature is no spendthrift, but takes the shortest way to her ends.

Things have their laws as well as men, and things refuse to be trifled with.

Cities give not the human senses room enough. We go out daily and nightly to feed the eyes on the horizon, and require so much scope, just as we need water for our bath.

All history is the decline of war, though the slow decline. All that society has yet gained is mitigation; the doctrine of the right of war still remains.