We cannot pretend to 'choose' our victories and expect to forge a winning mentality worthy of the name. This is the quintessential nature of winning - you either want it every time or you're not really trying to win. Jenas said as much about us under Harry a few weeks ago; he said that we generally went into campaigns looking to secure 70+ points, possible CL qualification, and so on - and thus we weren't really accustomed to wanting to win every week, or even on any week that didn't matter to the first two objectives. He went on to cast that in purely negative terms - said it didn't foster a culture of winning every week, which was something Arsenal similarly were lacking (he was talking about them and their recent struggles).
To win, you start by wanting to win every week, every day, every minute - from the smallest game of man-in-the-middle to climactic CL games at the Bernabeu, or the Allianz Arena, or the San Siro. Anything less, and you're settling - this may achieve your limited objectives, but it will never foster the sort of winning mentality that carried United (for example) through two glorious decades.
This sort of thing is not conducive to fostering a winning mentality. And I think Poch knows that at least as well as Jermaine Jenas does.