To laugh often and much ... this is to have succeeded. Probably not from Emerson: here's the full quotation and the story.
Ralph Waldo EmersonIf you would learn to write, it is in the street you must learn it. Both for the vehicle and for the aims of fine arts, you must frequent the public square. The people, and not the college, is the writer's home. A scholar is a candle which the love and desire of all men will light.
Ralph Waldo EmersonGo out of the house to see the moon, and 't is mere tinsel; it will not please as when its light shines upon your necessary journey. The beauty that shimmers in the yellow afternoons of October, who could ever clutch it? Go forth to find it, and it is gone: 't is only a mirage as you look from the windows of diligence.
Ralph Waldo Emerson