When one door closes, another opens; but we often look so long and so regretfully upon the closed door that we do not see the one which has opened for us.

Our most original compositions are composed exclusively of expressions derived from others.

You cannot force ideas. Successful ideas are the result of slow growth. Ideas do not reach perfection in a day, no matter how much study is put upon them. It is perseverance in the pursuit of studies that is really wanted.