OF THE LIFE OF THE PAINTER IN HIS STUDIO.

To the end that well-being of the body may not injure that of the
mind, the painter or draughtsman must remain solitary, and
particularly when intent on those studies and reflections which will
constantly rise up before his eye, giving materials to be well
stored in the memory. While you are alone you are entirely your own
[master] and if you have one companion you are but half your own,
and the less so in proportion to the indiscretion of his behaviour.
And if you have many companions you will fall deeper into the same
trouble. If you should say: "I will go my own way and withdraw
apart, the better to study the forms of natural objects", I tell
you, you will not be able to help often listening to their chatter.
And so, since one cannot serve two masters, you will badly fill the
part of a companion, and carry out your studies of art even worse.
And if you say: "I will withdraw so far that their words cannot
reach me and they cannot disturb me", I can tell you that you will
be thought mad. But, you see, you will at any rate be alone. And if
you must have companions ship find it in your studio. This may
assist you to have the advantages which arise from various
speculations. All other company may be highly mischievous.

The distribution of time for studying (495-497).