Bonhoeffer (quote from Marsh’s bio):

The earth that nourishes me has a right to my work and my strength. It is not fitting that I should despise the earth on which I have my life; I owe it faithfulness and gratitude. I must not dream away my earthly life with thoughts of heaven and thereby evade my lot—to be perforce a sojourner and a stranger—and with it God’s call into this world of strangers. There is a very godless homesickness for the other world, and it will certainly create no homecoming. I am to be a sojourner, with everything that entails. I must not close my heart indifferent to the earth’s problems, sorrows and joys; rather I am to wait patiently for the redemption of the divine promise—truly wait, and not rob myself of it in advance by wishing and dreaming.