...the wise words of a friend and guide rang in my head. 'How would you distinguish a true servant of God from a traitor?...You should take especial notice of how a person speaks, not of other things, but of God. ↗
To remove this obstacle I repeat or refer to such knowledge as has come under my notice, my own previously expressed views, and also describe and exhibit my last experiments and explain their novelty and utility. ↗