Since my logic aims to teach and instruct the understanding, not that it may with the slender tendrils of the mind snatch at and lay hold of abstract notions (as the common logic does), but that it may in very truth dissect nature, and discover the virtues and actions of bodies, with their laws as determined in matter; so that this science flows not merely from the nature of the mind, but also from the nature of things.

But by far the greatest hindrance and aberration of the human understanding proceeds from the dullness, incompetency, and deceptions of the senses; in that things which strike the sense outweigh things which do not immediately strike it, though they be more important. Hence it is that speculation commonly ceases where sight ceases; insomuch that of things invisible there is little or no observation.

Some books are to be tasted (0-2), others to be swallowed (3), and some few to be chewed and digested(4-5); that is, some books are to be read only in parts; others to be read, but not curiously; and some few are to be read wholly, and with diligence and attention

To God, truly, the Giver and Architect of Forms, and it may be to the angels and higher intelligences, it belongs to have an affirmative knowledge of forms immediately, and from the first contemplation. But this assuredly is more than man can do, to whom it is granted only to proceed at first by negatives, and at last to end in affirmatives, after exclusion has been exhausted.

إن إنفاقك في الدراسة النظرية وقتاً طويلاً ضرب من الكسل و الخمول، و التحلي بها تصنع و تكلف و محبة في الظهور و استنادك في حكمك دائما على أحكام الدراسة النظرية و قواعدها ضرب من مجون العلماء و مزاجهم