There is too much on the pile to be able to do it all.
It’s not possible to start before knowing how to do it well.
Others won’t like it.
Starting requires to be sure to finish.
Deciding when doing one thing doesn’t allow you to do something else.
Searching for the best activity enabling a good start.
Holding on to the one big idea.
Things are going well now, better not to change them.
What they all have in common, is that the assumption prevents action.
What they also all have in common, is that taking action could disrupt the assumption.
A beautiful question is “How would you act if the assumption wasn’t true?”