To Be Attacked by the Enemy is not a Bad Thing but a Good Thing

I hold that it is bad as far as we are concerned if a person, a political party, an army or a school is not attacked by the enemy, for in that case it would definitely mean that we have sunk to the level of the enemy. It is good if we are attacked by the enemy, since it proves that we have drawn a clear line of demarcation between the enemy and ourselves. It is still better if the enemy attacks us wildly and paints us as utterly black and without a single virtue; it demonstrates that we have not only drawn a clear line of demarcation between the enemy and ourselves but achieved a great deal in our work.

Mao Tse-tung