I think one should never be too busy to teach those who are anxious to learn.
If they don't depend on true evidence, scientists are no better than gossips.
However, no two people see the external world in exactly the same way. To every separate person a thing is what he thinks it is - in other words, not a thing, but a think.
A good book is the precious life-blood of a master-spirit, embalmed and treasured up on purpose to a life beyond life, and as such it must surely be a necessary commodity.
But time given to wishing for what can't be is not only spent, but wasted, and for all that we waste we shall be accountable.
