Which would you prefer – working for the rest of your life and getting paid
with miserable monthly salary or working only once but continued to be paid
for the rest of your life?
If you work only once and get paid many times over, you're earning a "residual" income. Of course you would and should choose the latter.
Therefore in order to build wealth, you need to tap into "residual" income.
Very often this is also referred to as "passive"income because you could afford to be passive or non-active (i.e. not having to work) and still continue to receive income.
Many of us have been brought up to have only one major objective in life – that is to get a good job for life! We work hard in schools so that we could get good grades to advance to colleges and universities where we work even harder so that you could get a good and secured "job". And this quest is never ending leading many to fall into the trap of "rat race" despite the fact that many could be drawing quite a handsome salary!