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"Only a solitary man" is from Willa Cather's novel *The Professor's House*. The quote is from a character named Godfrey St. Peter, who is reflecting on his life and his relationship with his dead wife. St. Peter says, "Only a solitary man knows how much of his life is given to anxiety and to solitude, how often his laughter only hides his tears, how little of his life he truly lives."
* "That is happiness" is from Willa Cather's novel *My Ántonia*. The quote is from the character Jim Burden, who is describing his feelings about living in the Nebraska countryside. Burden says, "That is happiness; to be dissolved into something complete and great."