Thinking and planning are necessary parts of personal progress. I think not. The second phrase of the Rede discusses the individual out of context. That is, it would if it were possible. Happily, it's just plain not.
Life is relational, contextual.
It is simply impossible for creatures who eat to harm none. Any refusal to decide or act for fear of harming someone is also a decision and an action, and will create results of some kind. The Craft, assuming ethical adulthood, offers us no rote rules. We will always be working on incomplete knowledge. We will sometimes just plain make mistakes.