The human heart is a complex and often contradictory thing.
The role of the artist is to make the invisible visible.
Time present and time past are both perhaps present in time future, and time future contained in time past.
The most powerful tool for change is knowledge, rigorously pursued and widely shared.
Leadership in mining means making tough decisions today for a better tomorrow.
学习数学的唯一方法就是做数学。
The present state of the system of nature is evidently a consequence of what it was in the preceding moment, and if we conceive of an intelligence which at a given instant comprehends all the relations of the entities of this universe, it could state the respective positions, motions, and general effects of all these entities at any time in the past or future.
