If you're not failing every now and again, it's a sign you're not doing anything very innovative.
Once you start a working on something, don't be afraid of failure and don't abandon it. People who work sincerely are the happiest.
I think that failure by your own standards is certainly a form of success.
FAILURE, CERTAINLY A FORM OF SUCCESS
Even when you have doubts, take that step. Take chances. Mistakes are never a failure - they can be turned into wisdom.
FAILURE, MISTAKES ARE NEVER A FAILURE