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The great entrepreneurs and the people that back them have long acknowledged the power of believing what you believe intensely, at least and until you don't believe that anymore.
Sometimes called the dumb fly, smart fly approach. The dumb fly keeps banging away on the same spot on the window trying to pass through. The smart fly keeps hitting different spots to find the opening from the willingness to experiment on the point of attack.
For most start up entrepreneurs, the unwillingness to try and fail while continuing iterating an approach is the seed of failure. Experimentation and innovation are the pathways to success. My dialogue with CEO's usually involves a lot of conversation about it being ok to progress with failed experiments. In my experience, the start up CEO that doesn't iterate, adapt and grow is the one left behind by the company's success.
As VC's, we are perfectly happy to see it all work out perfectly on the first attempt. Then again, we don't always expect it to and the CEO needs to be comfortable with that.