When we read, another person thinks for us: we merely repeat his mental process.
The mind must be given relaxation — it will rise improved and sharper after a good rest. Just as we must not force fertile farmland, for uninterrupted productivity will soon exhaust it, so constant effort will sap our mental vigor.
In reading of many books is distraction. Accordingly, since you cannot read all the books which you may possess, it is enough to possess only as many books as you can read.
Man can do what he wills, but he cannot will what he wills.
Opinion is like a pendulum and obeys the same law. If it goes past the centre of gravity on one side, it must go a like distance on the other; and it is only after a certain time that it finds the true point at which it can remain at rest.
Bad books are intellectual poison; they destroy the mind.