I say that the power of vision extends through the visual rays to the surface of non-transparent bodies, while the power possessed by these bodies extends to the power of vision.

One can have no more mastery over the environment, than one has over himself.

To enjoy - to love a thing for its own sake and for no other reason.

The color of the object illuminated partakes of the color of that which illuminates it.

If you put on more clothes as the cold increases, it will have no power to hurt you. Let us hope that.

Here is a thing which the more it is needed the more it is rejected: and this is advice, which is unwillingly heeded by those who most need it, that is to say, by the ignorant.

If you are representing a white body let it be surrounded by ample space, because as white has no colour of its own, it is tinged and altered in some degree by the colour of the objects surrounding it