Having multiple sources of income is good but when there isn't stability of the outcome of income or wages at the end of the day, there is sure to be poverty and lack of financial power.
Therefore, do you think that a source of income must be steady enough for years, before one can be financially free or rich or very wealthy, depending on the source(s) of income?
People with multiple incomes can make good investments to make their income permanent when they accumulate good capital. A certain amount of capital may be required to maintain income stability, and more than one source of income may be needed to obtain this capital.
In order to be financially stable and wealthy, it is necessary to have a stable income. This can vary slightly depending on the amount of money earned, as money above a certain level can be considered wealth even if it is not a regular income.