Graham tells us his background story and teaches the basics of investing. Many business owners think that their businesses will make them wealthy, they won't. Statistics show that most will end up making as much as they would have done if they stayed in the day job.
The key to creating long term sustainable wealth lies in income producing assets, particularly passive-income

Build a lifestyle business that generates cash, invest that surplus cashflow into an asset-based investment business
45: Lifestyle vs Investment Business, Graham’s story