actress viola davis completed her award season haul with a well-deserved best supporting actress oscar for her forceful portrayal of rose maxson in the movie revival of august wilson's play `fences`.davis, 51, has been winning hearts with her speeches at precursor awards like critics' choice, golden globes, sag awards and bafta and at the oscars, she once again delivered a poignant speech highlighting the importance of telling stories of people living on the margins.`people ask me all the time, what kind of stories do you want to tell viola. and i say exhume those stories, the stories of people who dreamed big and never saw those dreams... to people who fell in love and lost. i became an artist and thank god i did because we are the only profession that celebrate what it means to live a life,` she said to a resounding applause from the audience.the actress also credited fellow star and director denzel washington and playwright august wislon.`o captain! my captain! denzel washington. thank you for putting two entities in the driving seat-- august and god and they served you well,` davis said quoting walt whitman's famous poem.she also thanked her parents and sister with whom she played games where they were `rich white women` besides her husband and daughter.the actress was previously nominated in the best supporting actress category for her breakthrough role in 2008 ...