It's so crucial to set your financial priorities in life as this may help secure your financial future. Too much stress could come from mishandled funds. 
A lot of individuals have no idea precisely where or how they spend a good portion of their income. How many times have you taken money from the ATM only to realize a few days later that it's gone? Many times it's hard to remember how precisely you spent the money, and frequently this money is wasted on frivolous buys. 
A budget will help avoid this by making an individual accountable for the income that they spend. If an individual only has $50 left for monthly food expenses then they might decide to give up purchasing that fancy $3 designer cup of coffee.