The Ben Ish Chai suggests that when you have a new idea regarding how to earn money and you foresee yourself becoming wealthy, the Torah warns, make a fence around your mind. Do what you need to do to attain the wealth, but don’t fantasize about it because the imagination itself may cause you to lose your potential wealth.
This is because it was destined on Rosh Hashana for you to earn a lot of money, but you are enjoying it with your imagination! That pleasure might take the place of the actual wealth that could have been yours.
Emuna Daily 
Amen Ty
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HiCan you please provide location where this amazing thought is brought down?ThanksMT
Isn’t that amazing?! It’s a little longer than my typical quotes, but I had to share it. R’ Biderman discusses it. Check the Ben Ish Chai on Ki Seitzei regarding the passuk concerning “If you build a new house, you shall make a railing for your roof.” (22:8)