Happiness requires both pleasure and purpose - neither alone is sufficient.

我不喜欢做简单的事情。我喜欢做有挑战性并能推动我的事情。

解释：美色各不相同，看起来都很美好；动听的乐声各不相同，听起来都很快意。

我们是我们的选择。

You want to be extra rigorous about making the best possible thing you can. Find everything that's wrong with it and fix it. Seek negative feedback, particularly from friends.