investment plus stable job=steady income. although having a business cannot guarantee u to a total financial freedom or stable income i can say that if you have them both, at least there is a support if one does not succeed. we all know that putting a business was risky, you cannot predict if it will boom nor fall, i also suggest to look for what is in demand and can afford.
I think the being stable only depends on a stable job where you have fix amount coming in your stash. Investment as we all know does not pay soon. You need to wait for sometime in order for your investment to increment aside from that you need to get your RoI before you can tell that you are harvesting the profit in your investment.
About business, if you are well verse on the business you create, there is a higher possibility that this business will boom because you already know the do's and don'ts of this kind of business.