Musar zu Dewarim 25:17

זכור את אשר עשה לך עמלק … לא תשכח . I have found that the Torah divides this commandment into two halves. When the Jewish people are politically independent and strong, the part of the commandment we are obligated to fulfill is "to wipe out the memory of Amalek." When we are politically impotent we must still fulfill the part of the commandment which bids us "not to forget." One performs this part by cursing the name of Amalek and what that nation stands for.

"Remember what Amalek did to you…Do not forget." Amalek is the personification of the impurity of the body. Its spiritual representative is Samael himself. The latter is the "husband" of Lilith. Their prime endeavor is to undo the sanctity established between Israel and G–d by means of the holy Covenant of circumcision.