Weak ones allow Him to be strong in their stead. Those are the people whom He is able to anoint. If we puff ourselves up and feel we are doing God a favour we are not small enough. Such people will not serve God if they do not get their way. They desire God to remain weaker than themselves, not comprehending their utter weakness.
All humanity is weak, but on the humble recognize that.
King Saul was strong when he was small in his own eyes. He actually hid when it was time to make him king. But he became uplifted in himself as years passed. The anointed ones are the ones who are small in their own sight. God anoints them and mightily uses them.