Hans Urs Von Balthasar said this quote
“ We do not build the kingdom of God on earth by our own efforts (however assisted by grace); the most we can do through genuine prayer, is to make as much room as possible, in ourselves and in the world, for the kingdom of God, so that its energies can go to work. All that we can show our contemporaries of the reality of God springs from contemplation: Jesus Christ, the Church, our own selves. ”