A great fire burns within me, but no one stops to warm themselves at it, and passers-by only see a wisp of smoke. — Vincent van Gogh. Dutch painter (1853–1890)
If you hear a voice within you say "you cannot paint," then by all means paint and that voice will be silenced.
If one is master of one thing and understands one thing well, one has at the same time, insight into and understanding of many things.