Not all of your
401k dude. If you lose it all, it's no fun trying to rebuild it: TRUST ME.
If you lose it all, then "silly" things become more apparent as to where you money goes, "silly" things such as a home, a family, a car/truck, a nice family vacation, a retirement, a college education, etc....
Bottom line, don't use it all, unless it's less than $4,000 or you can max out your contributions each year, and still have enough to pay for those silly things.
Many want to retire early, but few can do it.