It is an expression that although it points in the first person, that is, to oneself, denotes a sibylline connotation of relaxed and idle. To understand it better we can go to the opposite extreme. We are in a meeting in which the image and appearance are monitored, the President at one point in the meeting says: we urgently need someone to deal with this task, and you who consider yourself with the skills to carry it out, answer: Sir. President, count on me, I am sure I gather the skills for it. You don't say there: the menda lerenda will do it.
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