社会主义的目标是共产主义。

The challenge is to make the invisible visible.

When we understand knowledge-based systems, it will be as before -- except our fingertips will have been singed.

【大意】干枯的竹子能生火，但不去钻它就不会燃烧；地下藏有泉源，但不去挖掘就流不出泉水来。