I am reading the book Pensées, and I can't understand a paragraph. Please help me review it.
The difference between the mathematical and the intuitive mind.—In the one, the principles are palpable, but removed from ordinary use; so that for want of habit it is difficult to turn one's mind in that direction: but if one turns it thither ever so little, one sees the principles fully, and one must have a quite inaccurate mind who reasons wrongly from principles so plain that it is almost impossible they should escape notice.
My understanding of this paragraph is that the writer wants to tell us the mathematical mind is not for ordinary use, and it is difficult to turn one's mind in a mathematical way because of the habit. (If this is wrong, please correct me.) The sentences after that ("but if one turns it thither ever so little...") is the part I didn't understand.
What exactly does "inaccurate mind" mean in this context?
Edit: One more question. What are the plain principles that anyone cannot escape?