When does perseverance and persistence become delusional?
For your vision, never. Vision is your grand goal, it’s something that you never reach but should always be working towards.
On execution and strategy, it’s hard to answer. It’s a question that entrepreneurs have been and will be asking for a long time. When should you abandon one thing or drastically change your strategy? It’s an impossible question to answer and maybe something that should be defined before you start down a certain path.