Learning never exhausts the mind.

If we make mistakes in our first compositions and do not know them, we may not amend them.

Be a mirror, absorb everything around you and still remain the same

O time, swift robber of all created things, how many kings, how many nations hast thou undone, and how many changes of states and of various events have happened since the wondrous forms of this fish perished here in this cavernous and winding recess. Now destroyed by time thou liest patiently in this confined space with bones stripped and bare; serving as a support and prop for the superimposed mountain.

First study the science, and then practice the art which is born of that science.

An arch consists of two weaknesses which, leaning one against the other, make a strength.

He who loves practice without theory is like the sailor who boards ship without a rudder and compass and never knows where he may cast.