has acquir'd a Promptness to Meditation, who not only retains a clear and distinct Notions of the Mind, and carefully rejects all the confus'd Idea's of the Senses, and who has both leisure and a Wit to meditate, such a Man will hardly fall into Errors. But 'tis not of such a Man that we are now to Dis∣course; 'tis of the common sort of Men, who for the most part are of another Constitution.
The Consistence then, which we meet with at the years of Discretion in the Fibres of Mens Brains, is the cause, if it may be so said, of the Solidity and Consistence of their Errors: 'Tis the Seal that Seals their Prejudices, and all their false Opinions, and shelters 'em from the strength of Reason. In a word, the more Advantageous this Constitution of the Fibres of the Brain is to Persons well Educated, the more Disadvantageous it is to the greatest part of Men, since it confirms both the one and the other in their Present Thoughts and Opinions.
But Men are not only confirm'd in their Errors, when they are arriv'd at the Age of Forty or Fifty years; they are also more subject to fall into new ones; because, that believing themselves at that time able to judge of every thing, as indeed it would be∣come 'em to be so, they decide with presumption, and only consult their own Prepossessions; for Men never argue upon things, but in some relation to those Idea's which are most familiar to 'em. When a Chymist would Argue about some Natural Body, presently his Three Principles come into his Mind. A Peripatic immediately thinks of the four Elements, and the four first Qualities; another Philosopher refers every thing to other Principles. So that nothing can enter into the Mind of Man, which is not immediately infected with the Errors to which it is subject, or which does not augment the number of its Errors.
This Consistence of the Fibres of the Brain pro∣duces another very bad Effect, especially in Persons more advanced in years, which is, to make 'em un∣capable of Meditation: They cannot set themselves to the Consideration of those Things which they de∣sire