Listen well to all conversations and be instructed by them and take
all seriousness seriously. Never look down on anyone or anything as
not worthy of your notice. In university or out of university, read!
And form opinions!

Know all that you can, both curricular and noncurricular -
mathematics and physics and economics, logic, and particularly
history. Know at least two languages besides your own, but anyway,
know {Italian}. Look at pictures and more pictures. Look at every
kind of visual symbol, every kind of emblem.

And remember that you are trying to learn what you think.

Know all you can about art, and by all means have opinions. Never
be afraid to become embroiled in art or life or politics; never be
afraid to learn or draw or paint better than you already do; and
never be afriad to undertake any kind of art at all, however exalted
or however common, but do it with distinction.

"...never be afriad to undertake any kind of art at all, however exalted or however common, but do it with distinction."

Reminds me of what C.S. Lewis once said "Even in literature and art, no man who bothers about originality will ever be original: whereas if you simply try to tell the truth (without caring twopence how often it has been told before) you will, nine times out of ten, become original without ever having noticed it."