Well, the fact is that one cannot retrace one's steps, and the steps one has taken greatly influence the future. — Vincent van Gogh. Dutch painter (1853–1890)
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.
A great fire burns within me, but no one stops to warm themselves at it, and passers-by only see a wisp of smoke.
If you hear a voice within you say "you cannot paint," then by all means paint and that voice will be silenced.