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"A hundred load of worry will not pay an ounce of debt. He that once deceives is ever suspected." 
George Herbert, Jacula Prudentium, 1651.

Demi Lovato [Frozen] — Let It Go
https://www.youtube.com/watch?v=SzOMo5gkUnA

"That in which they are vicious they will also be unjust: the stupid man through being illuded about justice and injustice."
Aristotle, Book I, Chapter 5 Litigation, Section 10 Injustice, 1368b20 [friendliness is justice in the full sense].

Just a friendly practice run about betrayal repaid: henceforth persuasion by character & demonstration comes in handy. 

"So we must grasp the number and character of expedient and pleasant things." [Pleasure attends prospects of revenge.]
Aristotle, Rhetoric, Book I, Chapter 5 Litigation, Section 10 Injustice, 1369b25 [Premisses: deceit must not deflect justice.]