Date: 1603

"Thus conscience does make cowards of us all, / And thus the native hue of resolution / Is sicklied o'er with the pale cast of thought, / And enterprises of great pith and moment / With this regard their currents turn awry, / And lose the name of action."

— Shakespeare, William (1564-1616)

Date: 1641

"I am not that structure of limbs which is called a human body. I am not even some thin vapour which permeates the limbs - a wind, fire, air, breath, or whatever I depict in my imagination; for these are things which I have supposed to be nothing."

— Descartes, René (1596-1650)