世界的整个问题在于愚蠢的人和狂热分子总是对自己如此确定,而聪明的人则充满疑虑。
尿素合成是一个幸运的发现,但它开辟了一个新的研究领域。
The great question which, in all ages, has disturbed mankind, and brought on them the greatest part of their mischiefs, has been, not whether there be power in the world, nor whence it came, but who should have it.