If you are Christian, then you can give (invest) your 10% of your monthly earning, to God. Then believe that God will bless (profit) you much more then what you give to Him.
With New Mindset: You not give to God the 10%, but God give you 90%.
If you are not, then you still can follow the Christian way. Save the 10% of your earning. For your self. Do not touch it, until you retired.
With mindset: you not save the 10%, but you only earn 90%.
With that New Mindset, you will have huge different in your spending habbit.