First, because this passion is very dangerous to the conscience; second, because it imperceptibly involves us in evil studies that have more glamour than usefulness and truth; and finally, because it is very difficult to control, because we are often made fools by it, and because though we think we are enlightening our mind, we are perhaps only strengthening the concupiscence of pride, which not only corrupts the heart but also plunges the mind into such darkness as is morally impossible to illumine.