’In man God creates his image on earth. This means that man is like the Creator in that he is free. Actually he is free only by God’s creation, by means of the Word of God; he is free for the worship of the Creator. In the language of the Bible, freedom is not something man has for himself but something he has for others. No man is free “as such,” that is, in a vacuum, in the way that he may be musical, intelligent or blind as such. Freedom is not a quality of man, nor is it an ability, a capacity, a kind of being that somehow flares up in him. Anyone investigating man to discover freedom finds nothing of it. Why? because freedom is not a quality which can be revealed–it is not a possession, a presence, an object, nor is it a form of existence–but a relationship and nothing else. In truth, freedom is a relationship between two persons. Being free means “being free for the other,” because the other has bound me to him. Only in relationship with the other am I free.’
― Dietrich Bonhoeffer, (‘Creation and Fall / Temptation: Two Biblical Studies,’ p. 39-40)
This is another example of how critical relationship is in Bonhoeffer’s thought – just as Christ exists for me, I exist for others.