Rich: You can afford to have all the resources you need to succeed (equipment, teachers, time, etc.) so the only limiting factor for success is yourself (hard work, determination, etc.).
Poor: You can’t afford resources, and you have many more disadvantages to deal with.
This is why the Rich feel like hard work is all you need–from their perspective, they don’t understand the Poor’s “excuses” because they never experienced a lack of resources necessary for success.
Read more about articles in the Rich vs. Poor Series here.