In the Middle Age, in Germany, if you wanted to learn addition and multiplication, you could go to any university. But if you wanted to learn division, you could only do it in one place, Heidelberg. This makes sense, since in my theory with Vladimir Retakh and Robert Wilson, addition and multiplications are cheap, but division is expensive.
Now even if I die, no one will be so grieved as to do himself bodily harm. No [. . . ] I know just how much sadness my death will cause you. Undoubtedly you will weep when you learn the news--apart, of course, from such ornamental sentimentality as you may indulge in--but if you will please try to think of my joy at being liberated completely from the suffering of living and this hateful life itself, I believe that your sorrow will gradually dissolve.
Each day look into your conscience and amend your faults; if you fail in this duty you will be untrue to the Knowledge and Reason that are within you. Keep a watchful eye over yourself as if you were your own enemy; for you cannot learn to govern yourself, unless you first learn to govern your own passions and obey the dictates of your conscience.