１％のひらめきだって努力から生まれるんですよ One per cent inspiration will be produced from an effort.

どんな分野でも、新しい何かを生み出すのは「１％ひらめきと９９％の努力」というのは共通なのでしょう。
ひらめく人はたくさんいますけど、それを誰もが認めるきちんとした形にする努力ができる人は、それほど多くないんですよね。　ひらめくだけで「天才かも」と勘違いしちゃう人がなんと多いことか。

The words "One per cent inspiration, ninety-nine per cent perspiration" is the same in any field.
There are many people who can have an inspiration. But there is not many people who can do effort to make it complete that is recognized by anyone.
There are many people who misunderstanding "I may be a genius" themselves by just an inspiration.