“What sunshine is to flowers, smiles are to humanity. These are but trifles, to be sure; but scattered along life's pathway, the good they do is inconceivable.”
This appears as an anonymous proverb in Frank Leslie's Sunday Magazine Vol. XIII, (January - June 1883) edited by T. De Witt Talmage, and apparently only in recent years has it become attributed to Addison.
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Joseph Addison 226
politician, writer and playwright 1672–1719Related quotes

(1836-2) (Vol.47) Songs-IV.
The Monthly Magazine

“What is all human conduct but the daily and hourly sale of our souls for trifles?”
1900s, Major Barbara (1905)
Context: It is not the sale of my soul that troubles me: I have sold it too often to care about that. I have sold it for a professorship. I have sold it for an income. … What is all human conduct but the daily and hourly sale of our souls for trifles?

Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 26.