"There has been a day of calling, but the time has come for a day of choosing; and let those be chosen that are worthy."
Doctrine and Covenants 105:35
This is interesting. We know from other scriptures that many are called, but few are chosen (Matthew 22:14, D&C 121:40), but putting it this way seems more active and less abstract. Instead of inspiring us to philosophize about what being "chosen" means, this urges us to do something about it. :) This chapter is talking about building Zion in a very literal sense... this was during the mob violence in Missouri. God was telling the people that they weren't ready for a literal Zion yet... they still weren't being obedient, they still weren't giving to the poor, and they had some work to do. So, they needed to take a step back and start working on the basics again... like being chosen.
We're still in this situation. We're not ready for a literal Zion yet. We're *all* called... but we have to work at being chosen. It says that the worthy should be chosen, so that is a good thing to think about. Are we worthy? Worthy of being chosen by God? Worthy of Zion? Those are big questions... and it isn't just an ego struggle where we have to convince ourselves that we're cool enough. :) It's really doing what God asks. Loving and taking care of the people around us... working at being the kind of person that could live in a Zion society... taking care of the poor, being part of the united order (sharing our goods and property with others), etc. Today, let's be the chosen people, by working on our worthiness.