I tried to follow the same advice when I was starting out. And sadly, I just wasted more than 7 months trying to make it work. I would never repeat it now.
You have to follow your passion - BUT - make sure there`s a MARKET for your passion. Make sure people are spending money on what your passion is. Other wise, you will keep babbling around for months, with very poor results, or no results at all.
Now I do follow my passion to help people. But I apply this passion to profitable niches
That`s where the money is.