Authors:

The 'kingdom of Heaven' is a condition of the heart - not something that comes 'upon the earth' or 'after death.'

Friedrich Wilhelm Nietzsche, Thomas Wayne (2004). “Ecce Homo: How One Becomes what One is; The Antichrist: a Curse on Christianity”, p.135, Algora Publishing
The 'kingdom of Heaven' is a condition of the heart - not something that comes 'upon the earth' or 'after death.'