12. It would be impossible to banish fear on matters of the highest importance, if a person did not know the nature of the whole universe, but lived in dread of what the legends tell us. Hence without the study of nature there was no enjoyment of unmixed pleasures. 13. There would be no advantage in providing security against our fellow humans, so long as we were alarmed by occurrences over our heads or beneath the earth or in general by whatever happens in the boundless universe. 14. When tolerable security against our fellow humans is attained, then on a basis of power sufficient to afford supports and of material prosperity arises in most genuine form the security of a quiet private life withdrawn from the multitude. 15. Nature's wealth at once has its bounds and is easy to procure; but the wealth of vain fancies recedes to an infinite distance. 16. Fortune but seldom interferes with the wise person; his greatest and highest interests have been, are, and will be, directed by reason throughout the course of his life. 17. The just person enjoys the greatest peace of mind, while the unjust is full of the utmost disquietude. 18. Pleasure in the body admits no increase when once the pain of want has been removed; after that it only admits of variation. The limit of pleasure in the mind, however, is reached when we reflect on the things themselves and their congeners which cause the mind the greatest alarms.