Johann Wolfgang von Goethe

To the natural philosopher, there is no natural object unimportant or trifling. From the least of Nature's works he may learn the greatest lessons.

Speculations apparently the most unprofitable have almost invariably been those from which the greatest practical applications have emanated.

No doubt the testimony of natural reason, on whatever exercised, must, of necessity, stop short of those truths which it is the object of revelation to make known; still it places the existence and personal attributes of the Deity on such grounds as to render doubts absurd and atheism ridiculous.

The barrier has begun to yield.

Every student who enters upon a scientific pursuit, especially if at a somewhat advanced period of life, will find not only that he has much to learn, but much also to unlearn.

The stars are the land-marks of the universe.