Attitude toward enemies

A quote from Dietrich Bonhoeffer.

Don't forget that he voluntarily returned to Germany from a safe position in New York because he felt he could not minister to his people after the Nazi regime was gone if he didn't suffer with his people under the regime.
And we was finally hanged by the Nazis in prison in 1945, just three weeks before the liberation. He has the right to speak about the Christian attitude towards enemies:

[N]ever be conceited. With respect to our attitude toward our enemies, this means first, remember that you were God's enemy and that, without having earned it or being worthy of it, you were met with mercy. It means second, remember that God hung on the cross for your enemy too, and love God and God loves you.

- Dietrich Bonhoeffer