Here’s a surprisingly profound question: What is a promise? Dictionaries offer various definitions. I like this one: “An express assurance on which expectation is to be based.”

Image: Simon James via Flickr
That definition captures the two-sided nature of a promise. One party offers an assurance, which the other converts into an expectation. You deposit money in your checking account, and the bank assures you that you can have it back on demand. You expect that the bank will fulfill its promise when you visit an ATM.
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