to express what you think or want yourself, rather than sb else doing it for you :
I'm quite capable of speaking for myself, thank you!
to express what you think or want yourself, rather than sb else doing it for you :
I'm quite capable of speaking for myself, thank you!
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005