The Ego -- Consider the ego as the referee between both the id and the superego. The ego's job is to satisfy the id while also working within the confines of the superego. This isn't the ego in the traditional sense, but rather that component of the mind that acts as the primary driver of the psychic apparatus. Since every person is unique with unique experiences, the ego works differently in each of us.
Invest your time. For example, you might like having free time, so you give yourself a few hours a day to do nothing. But if you were to invest those few hours into getting rich, you could work towards having 20 years of free time (24 hours a day!) with early retirement. What can you give up now in exchange for being rich later? Investment advisor Dave Ramsey likes to tell his radio audience, "Live like no one else today so that you can live like no one else tomorrow."
Borrowing could be a key element in this method. Say you borrow $200,000 and put in $50,000 of your own to buy a property for $250,000. Then you develop the property and sell it for $400,000. The property has increased in value by 60% but your $50,000 has now grown fourfold to $200,000. You have to select the right properties in the right areas and develop them wisely.