Men are as innocent as the morning to the unsuspicious.
 Henry David Thoreau, A Week on the Concord and Merrimack Rivers (1849). copy citation

Context

“In my short experience of human life, the outward obstacles, if there were any such, have not been living men, but the institutions of the dead. It is grateful to make one’s way through this latest generation as through dewy grass. Men are as innocent as the morning to the unsuspicious. “And round about good morrows fly, As if day taught humanity.” Not being Reve of this Shire, “The early pilgrim blithe he hailed, That o’er the hills did stray, And many an early husbandman, That he met on the way”;—” source