"Approach or come: refers not to the physical act of coming, but to the mental attitude; the heart is mentioned for sincerity. When they sincerely promise not to fight against you, do not pursue them. Remember that if they had fought against you, your difficulties would have been increased. Their neutrality itself may be a great advantage to you. So long as you are satisfied that they are sincere and their acts support their declarations of peace with you, you should not consider yourself justified in pursuing them and warring against them."
-- Abdullah Yusuf Ali