For if once a man indulges himself in murder, very soon he comes to think little of robbing; and from robbing he comes next to drinking and Sabbath-breaking, and from that to incivility and procrastination. Once begin upon this downward path, you never know where you are to stop.

There was no friend of Kant's but considered the day on which he was to dine with him as a day of pleasure. Without giving himself the air of an instructor, Kant really was so in the very highest degree. The whole entertainment was seasoned with the overflow of his enlightened mind, poured out naturally and unaffectedly upon every topic, as the chances of conversation suggested it; and the time flew rapidly away, from one o'clock to four, five, or even later, profitably and delightfully. Kant tolerated no calms, which was the name he gave to the momentary pauses in conversation, or periods when its animation languished.

the opium-eater cannot present himself in the character of l'Allegro: even then, he speaks and thinks as becomes Il Penseroso.