More on One Touch of Nature Makes the whole World Kin from Infoplease:

• One Touch of Nature Makes the whole World Kin - One Touch of Nature Makes the whole World Kin (Shakespeare: Troilus and Cressida, iii. 3.). Source: ...
• William Shakespeare: Troilus and Cressida, Act III, Scene III - Now, princes, for the service I have done you, The advantage of the time prompts me aloud To call for recompense. Appear it to your mind That, through
• Dictionary of Phrase and Fable: O - Definitions, origins, and illustrative excerpts for words, phases, and literary allusions starting with "O"