It depends on what you want: security, comfort or getting rich.
If you want to get rich, you want to use as much leverage as you can (otherwise it'd take a thousand years). This includes other peoples time (e.g. employees) and other peoples money (e.g. clients, investors or loans). In both cases you use debt because you owe these people. But it's good debt which is fine because it grows your wealth.
Why would you want to get rich? To be able to contribute more to the society
But that's another post.