Cold winds are disagreeable, hot winds enervating, moist winds unhealthy.

Noting all these things with the great delight which learning gives, we cannot but be stirred by these discoveries when we reflect upon the influence of them one by one.

The design of a temple depends on symmetry, the principles of which must be most carefully observed by the architect.

Astronomers have a common ground for discussion with musicians in the harmony of the stars and musical concords in tetrads and triads of the fourth and the fifth, and with geometricians in the subject of vision; and in all other sciences many points, perhaps all, are common so far as the discussion of them is concerned. But the actual undertaking of works which are brought to perfection by the hand and its manipulation is the function of those who have been specially trained to deal with a single art.

When the juices of trees have no means of escape, they clot and rot in them, making the trees hollow and good for nothing.

In the midst of all this great variety of subjects, an individual cannot attain to perfection in each, because it is scarcely in his power to take in and comprehend the general theories of them.

The thickness of the walls should be sufficient for two armed men to pass each other with ease.