to be able (to do);  to be capable (of doing)
 as much as possible;  as far as possible;  to the best of one's abilities
 too much thinking gets you nowhere;  excessive enthusiasm clouds one's judgment
 unable to do;  impossible to do
 even the strong will grow weak; (lit.) (even an arrow fired from) a strong bow loses momentum until it cannot even penetrate a piece of thin silk from Lu