It is the function of parents to see that their children habitually experience the true consequences of their conduct.
Herbert SpencerThe preservation of health is a duty. Few seem conscious that there is such a thing as physical morality.
Herbert SpencerIf a single cell, under appropriate conditions, becomes a man in the space of a few years, there can surely be no difficulty in understanding how, under appropriate conditions, a cell may, in the course of untold millions of years, give origin to the human race.
Herbert Spencer