Knowledge has two extremes. The first is the pure natural ignorance in which all men find themselves at birth. The other extreme is that reached by great minds, who, having run through all that men can know, find they know nothing, and come back again to that same natural ignorance from which they set out; this is a learned ignorance which is conscious of itself.

All the troubles of life come upon us because we refuse to sit quietly for a while each day in our rooms.

The statements of atheists ought to be perfectly clear of doubt. Now it is not perfectly clear that the soul is material.

Knowledge has two extremes. The first is the pure natural ignorance in which all men find themselves at birth. The other extreme is that reached by great minds, who, having run through all that men can know, find they know nothing, and come back again to that same natural ignorance from which they set out; this is a learned ignorance which is conscious of itself.

We conceal it from ourselves in vain - we must always love something. In those matters seemingly removed from love, the feeling is secretly to be found, and man cannot possibly live for a moment without it.

The past and present are only our means; the future is always our end. Thus we never really live, but only hope to live.

Who knows if this other half of life where we think we're awake is not another sleep a little different from the first.