As long as the mind is seeking to fill itself, it will always be empty. When the mind is no longer concerned with filling its own emptiness, then only does that emptiness cease to be.
Nakedness is uncomely, as well in mind as body, and it addeth no small reverence to men's manners and actions if they be not altogether open. Therefore set it down: That a habit of secrecy is both politic and moral.
When chaste people need body or mind to resort to action or thought, they find steel in their muscles or knowledge in their intelligence. Theirs the diabolic vigor or the black magic of will power.
The senses collect the surface facts of matter... It was sensation; when memory came, it was experience; when mind acted, it was knowledge; when mind acted on it as knowledge, it was thought.
Louis Pasteur, the great scientist, said "chance favours the prepared mind", which is a posh way of saying 'do your homework', but it's an excellent piece of advice.