This is a question asked by Immanuel Kant and according to another philosopher, Michael Novak, partially answered by the Incarnation of Jesus Christ.
“One of the most profound lessons of the Incarnation is the difficult teaching that one must learn to be humble, think concretely, face facts, train oneself to realism. There are some who always imagine hope in utopian terms. Their hope depends upon the world changing, either back into the Paradise of time’s beginning or ahead into the Nowhere of the future.
“The Incarnation is a doctrine of hope but not of utopia. If God so willed His beloved Son to suffer, why would He spare us? If God did not send legions of angels to change the world for Him, why should we idly dream of sudden change for us? Christian hope is realistic, braced for darkness and cruelty, alert to the forces of unreason and of sin …
“The point of the Incarnation is to respect the world as it is, to acknowledge its limits, to recognize its weaknesses, irrationalities, and evil forces, and to disbelieve any promises that the world is now, or every will be transformed into the City of God. If Jesus could not affect that, how shall we?
“The world is not going to become—ever—a kingdom of justice and love. This is not a counsel against hope. It is a moderate and realistic response to the questions of Kant: ‘Who are we? What ought we to do? What may we hope?”
The Spirit of Democratic Capitalism by Michael Novak.