The Kingdom of God is Within You by Leo Tolstoy Chapter 12 Page 190

It is this violent effort to rise above external conditions to the recognition and realization of truth by which the kingdom of heaven is taken, and it is this effort of violence which must and can be made in our times.

Men need only understand this, they need only cease to trouble themselves about the general external conditions in which they are not free, and devote one-hundredth part of the energy they waste on those material things to that in which they are free, to the recognition and realization of the truth which is before them, and to the liberation of themselves and others from deception and hypocrisy, and, without effort or conflict, there would be an end at once of the false organization of life which makes men miserable, and threatens them with worse calamities in the future.