The invariable mark of wisdom is to see the miraculous in the common.
Source: Nature, Ralph Waldo Emerson, 1836
From Emerson's first book, 'Nature' (1836), in the closing chapter 'Prospects'. The sentence is quoted accurately here and sits in the passage arguing that wisdom consists in perceiving the miraculous within the ordinary — the culminating movement of the essay.
The reward of a thing well done is to have done it.
Source: "New England Reformers"
It is one of the most beautiful compensations of this life that no man can sincerely try to help another without helping himself.
Source: Essays: First Series ('Compensation'), Ralph Waldo Emerson, 1841
Genuine Emerson, from the essay 'Compensation' in Essays: First Series (1841). The wording here matches the essay text closely ('It is one of the most beautiful compensations of this life, that no man can sincerely try to help another without helping himself'). This is one of the few heavily circulated Emerson lines with a solid primary source.