He 'dedicated' [='devoted'] his life/time 'to' helping the poor. = He 'dedicated himself to' helping the poor. [=he used his time, energy, etc., to help the poor]
We have a 'dedicated' phone line for our computer. [=a phone line that we use only for our computer]
They are a group of highly 'dedicated' [='committed', 'enthusiastic'] individuals.
(..) whoever they are, or however powerful they are. Least of all, my brothers, King Harald Finehair and his brother, for they are dedicated to our overthrow. Is that understood? We are all equally Ragnar's sons, but we are not equal in battle. So I will take the lead. I will establish the battle plans, (..)2017 TvShow: Vikings Title: Revenge Season: 4 Episode 18
(..) you marry a nobody! I have built my entire life around you. Everything I have done, I have done for you, and the gods. I have dedicated my life to you. Please, no! I love you. Please don't kill me. Please. Who gives this woman (..)2017 TvShow: Vikings Title: Revenge Season: 4 Episode 18