Answer:
Mental power is also more important than physical power/strength because all training is essentially mental training. Physical training trains muscles, but more importantly, it trains and develops neural networks in the brain.
Mental power without any strength or very little strength will be doomed. In some cases, superior mental power can trick physical power into a course that dooms its existence. So in summary, in the real world, mental power amplifies physical power but the converse is not true.
