Bachelor degree

I really do not know how to say only good sister, in her opinion Bachelor degree is not important, she felt it was just a certificate, no big deal, she still failed to recognize the importance of Bachelor degree, how do I persuade her, she did not listen, she does not listen to me there is no way, in fact, did not regret my very own to test the Bachelor degree, I was also a sister and now psychology is the same, I feel nothing, but when I am looking for work to society, I came to understand the importance of Bachelor degree, that not only represents your cultural level, it is our job, when a very favorable weight, in order to prevent future I regret I did my sister advised her, and now she does not listen, I have no other choice.