Only learn to seize good fortune, for good fortune's always here.

In nature we never see anything isolated, but everything in connection with something else which is before it, beside it, under it and over it.

That which thy fathers have bequeathed to thee, earn it anew if thou wouldst possess it.

Science has been seriously retarded by the study of what is not worth knowing and of what is not knowable.

The aim of living is life itself.

With knowledge comes more doubt.

To understand one thing well is better than understanding many things by halves.