One of the most important qualities for writers is that of perseverance. So many other circumstances have impact on success and failure that are outside of the direct control of the writer, but there is one that is in his/her ability to control: perseverance, the ability to keep writing, no matter what is happening. Here are a few quotations about that quality.
“Always bear in mind that your own resolution to succeed is more important than any one thing.”
“Amateurs sit and wait for inspiration, the rest of us just get up and go to work.”
Stephen King, On Writing: A Memoir of the Craft
“If you fell down yesterday, stand up today.”