Thomas Hill.
"Instruction must begin with actual inspection, not with verbal descriptions of things. From such inspection it is that certain knowledge comes. What is actually seen remains faster in the memory than description or enumeration a hundred times as often repeated."
Comenius.
"Observation is the absolute basis of all knowledge. The first object, then, in education, must be to lead the child to observe with accuracy; the second, to express with correctness the results of his observation."
Pestalozzi.
"If in the external universe any one constructive principle can be detected, it is the geometrical."
Bulwer-Lytton.
"The education of the senses neglected, all after-education partakes of a drowsiness, a haziness, an insufficiency, which it is impossible to cure."
Lord Bacon.
"Of this thing be certain: Wouldst thou plant for eternity? Then plant into the deep infinite faculties of man, his fantasy and heart. Wouldst thou plant for year and day? Then plant into his shallow, superficial faculties, his self-love, and arithmetical understanding, what will grow there."