The gems of philosophy are not less precious because they are not understood.

Make then your forecasts, my lords Astrologers, with your slavish physicians, by means of those astrolabes with which you seek to discern the fantastic nine moving spheres; in these you finally imprison your own minds, so that you appear to me but as parrots in a cage, while I watch you dancing up and down, turning and hopping within those circles.

Our bodily eye findeth never an end, but is vanquished by the immensity of space.

The soul, in its power, is present in some way in the entire universe, because it apprehends substances which are not included in the body in which it lives, although they are related to it.

I pray you, magnificent Sir, do not trouble yourself to return to us, but await our coming to you.

When we consider the being and substance of that universe in which we are immutably set, we shall discover that neither we ourselves nor any substance doth suffer death. For nothing is in fact diminished in its substance, but all things, wandering through infinite space, undergo change of aspect.

They dispute not in order to find or even to seek Truth, but for victory, and to appear the more learned and strenuous upholders of a contrary opinion. Such persons should be avoided by all who have not a good breastplate of patience.