Really to sin you have to be serious about it. Henrik Ibsen
Some people have been unkind. If I say I want to grow as an actress, they look at my figure. If I say I want to develop, to learn my craft, they laugh. Somehow they don't expect me to be serious about my work. Marilyn Monroe
If you really want to contribute to our theoretical understanding of physical laws - and it is an exciting experience if you succeed! - there are many things you need to know. First of all, be serious about it! Gerardus 't Hooft
There seems to be this impression that if I really am a psychotherapist, I can't be serious about it. They think there must be something fishy going on. Pamela Stephenson
I think you should be serious about what you do because this is it. This is the only life you've got. Philip Seymour Hoffman
[As a painting teacher] I'm not flirting, playing around. I'm serious about it... If you don't want to be serious about playing [at art], do something of no account. Go into banking. Buy collar buttons at five cents a dozen and sell them for five cents a piece. John Sloan