If the study to which you apply yourself has a tendency to weaken your affections and to destroy your taste for those simple pleasures in which no alloy can possibly mix, then that study is certainly unlawful, that is to say, not befitting the human mind.
Mary Wollstonecraft ShelleyNothing contributes so much to tranquilize the mind as a steady purpose - a point on which the soul may fix its intellectual eye.
Mary Wollstonecraft Shelley