Much playing in society is more injurious than useful. Suit the taste and capacity of your audience; but never play anything which you know is trashy and worthless.
Do not miss an opportunity of practising music in company with others; as for example in Duets, Trios, etc.; this gives you a flowing and elevated style of playing, and self-possession.—Frequently accompany singers.
If all would play first violin, we could not obtain an orchestra. Therefore esteem every musician in his place.
Love your peculiar instrument, but be not vain enough to consider it the greatest and only one. Remember that there are others as fine as yours. Remember also that singers exist, and that numbers, both in Chorus and Orchestra, produce the most sublime music; therefore do not overrate any Solo.
As you grow up, become more intimate with scores (or partitions) than with virtuosi.