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?
Of course if your source of income is not always steady definitely there is no way you can be financially free or rich, just imagine staying for some couple of weeks without having a money that you can use to provide your family with their needs. Just imagine how difficult it is talk more of months, so is obvious that one can not be financially free or rich when his/ her source of income is not stable.
Which is why sometimes when pursuing for something that can profit us in the long run, we should always try to set up a business that will bring a stable income. So that is not going to affect us in anyway.