TANSTAAFL is a concept posited by Robert Heinlein, most notably used in his novel “The Moon is a Harsh Mistress.” It has a number of corollaries – everything you get is worth what you paid for it, beggars can’t be choosers, the end does not justify the means, every action has an equal and opposite reaction. Stated in the negative, it would akin to the Law of Unintended Consequences.
Everything we do has meaning and implications. Sometimes we understand the meaning and anticipate the implications. Those times are rare (though I’ll try to highlight them when I see them). Usually we do things because they are expedient or pragmatic or out of a rationalized sense of need.
We have become Narcissus.