The most vulnerable and yet most unconquerable of things is human vanity; nay, through being wounded its strength increases and can grow to giant proportions.
The majority of mankind is lazyminded, incurious, absorbed in vanities, and tepid in emotion, and is therefore incapable of either much doubt or much faith.
Whether a man hides his bad qualities and vices or confesses them openly, his vanity wants to gain an advantage by it in both cases: just note how subtly he distinguishes between those he will hide his bad qualities from and those he will face honestly and candidly.
The strongest knowledge (that of the total freedom of the human will) is nonetheless the poorest in successes: for it always has the strongest opponent, human vanity.
Some have lavish garments, carry sharp swords, and feast on food and drink. They possess more than they can spend. This is called the vanity of robbers. It is certainly not the Way.
The alchemists spent years in their laboratories, observing the fire that purified the metals. They spent so much time close to the fire that gradually they gave up the vanities of the world. They discovered that the purification of the metals had led to a purification of themselves.