for all one is worth

1. To the utmost of one's power or ability, as in Coming onto the homestretch she ran for all she was worth . [Second half of 1800s]

2. for all or for what it's worth ; for whatever it's worth . Even though it may not be important or valuable. For example, Here's my opinion, for what it's worth , or For whatever it's worth I've decided to take the train . [Late 1800s]