The Original Rooster
Mayor of Spring Hill
^^^This!^^^I asked this exact question and here was the response. If you have a 4% mortgage but are earning 10%, why would you throw away 6% earnings that are compounded yearly for the next 20 years. It worked out being almost $100,000. You have the peace of mind that you do have the funds to pay out the mortgage but why give away money?
Put your money in something that gains interest at a rate at least equal to your mortgage's rate. That way you get to keep your nest egg but still pay your house off without losing anything in the long run. If you want to pay it off sooner either make extra payments or refinance to a shorter term loan.