"We may be tossed upon an ocean where we can see no land - nor, perhaps, the sun or stars. But there is a chart and a compass for us to study, to consult, and to obey. That chart is the Constitution."

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Those who are in love with practice without knowledge are like the sailor who gets into a ship without rudder or compass and who never can be certain whether he is going. Practice must always be founded on sound theory, and to this Perspective is the guide and the gateway; and without this nothing can be done well in the matter of drawing.

— Leonardo da Vinci