Zeno Of Citium

Zeno stretched out his fingers, and showed the palm of his hand, – “Perception,” – he said, – “is a thing like this.”- Then, when he had closed his fingers a little, – “Assent is like this.” – Afterwards, when he had completely closed his hand, and showed his fist, that, he said, was Comprehension. From which simile he also gave that state a new name, calling it katalepsis (κατάληψις). But when he brought his left hand against his right, and with it took a firm and tight hold of his fist: – “Knowledge” – he said, was of that character; and that was what none but a wise person possessed.

~ Zeno of Citium.