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Thats why the quote is right, "rich get richer, the poor get poorer" because they don't have capital to invest, start a business, etc.
you are right that first we need to earn enough money that will give us big returns on investment, or enough money to start a small business which have high chances to grow and future.
some lucky people are able to get high returns or gain financial freedom because there are very less opportunity like bitcoin in early stage, people who invested early were lucky to gain high returns.
In my opinion ,poor are because of their mind of poor people. Poor people waste their money in useless things like buying mobile phone by installment and they pay 40 -50 percent extra. In comparison ,rich people save money and invest in asset that give high returns to them. They don't waste money by buying sell phone on installment but they buy by liquidity. They invest in businesses and they grow their portfolio and make friends that are knowledgeable person but poor people spend time with useless people and they take useless suggestions by useless people about money .And they remain poor but everyone can be rich by knowledge and struggle.