I have wasted my hours.
One can have no more mastery over the environment, than one has over himself.
The days are long enough for those who use them.
Shadow is the diminution alike of light and of darkness, and stands between darkness and light.
He who wishes to be rich in a day will be hanged in a year.
Those who become enamoured of the art, without having previously applied to the diligent study of the scientific part of it, may be compared to mariners who put to the sea in a ship without rudder or compass and therefore cannot be certain of arriving at the wished for port.