The phrase 'a reason enough' is correct and can be used in written English.
You can use it when you need to stress that the reason you mention is significant or valid. For example, "Her enthusiasm and dedication to the project is a reason enough to award her the position."
So, isn't that a reason enough to do philosophy?
That prospect may not be a reason enough to make a nuclear deal with Iran, but it should serve as reminder of just how high the stakes in Vienna are.
If you have read the numerous other books released in the past several years and are not familiar with name James Johnson, then that is a reason enough.
For example, millennials have a trade up-trade down mentality, meaning they will spend a modest premium on brands they deem worthy, but buy private label brands when the brand has failed to create a reason enough value to warrant the premium.
You think that some donation from Saudi Arabia to Clinton Foundation is a reason enough to mistrust Hillary and yet you have nothing to say about his suggestion that Saudi Arabia should be allowed to have nuclear weapons!
Scientifically Speaking Play is just plain fun, which is a reason enough to want more of it, but there are also scientific reasons to believe that play is instrumentally vital for well-being.
One is that a desire to watch a sunrise is reason enough to climb a hill.
Just amassing the forces necessary for Mahler's sprawling, 80-minute symphony and getting everyone through a performance is reason enough for an audience to cheer.
For customers, though, a price freeze on a drink is reason enough to buy one.
Such a gaffe on the tail of such a failure would seem reason enough for a governor to resign.
In the premiere we learn why a zipper was reason enough for Ms. Raymond not to buy a Chanel dress she examined at a buyers event.
