Why is wine forbidden in this life, yet permissible in the the Hereafter?

Allah Almighty described the wine of the Hereafter in a way that differs from the wine of this world, saying that it is: white, a delight for those who drink it, no 'ghoul' (harm/headache) in it, nor will they be exhausted by it. This is unlike the wine of this world, which impairs the mind and harms the body.