To succeed, planning alone is insufficient. One must improvise as well.

地质学研究的真正魅力在于从已知到未知的思维锻炼。

It is remarkable that a science which began with the consideration of games of chance should have become the most important object of human knowledge.

素描是艺术的诚实。没有欺骗的可能。它要么好，要么坏。

我不害怕冒险。我认为这就是生活的意义。