Lamentations 1:21

Thou hast done it. Judah’s enemies seem particularly pleased that it is her own God, who in times past delivered her so marvelously from her enemies, who has allowed destruction to come upon her.

Thou wilt bring the day. Literally, “thou hast brought.” So certain is the prophet that God’s judgments will ultimately fall also on the wicked nations who now oppress Judah, that he places his statement in the Hebrew perfect tense, indicating completed action. The fact that God used the heathen to punish Judah in no way implied that those nations were innocent of even greater sins (see ch. 5:11). The surety with which the promised punishment came to Judah only made more inevitable the fulfillment of the prophesied judgments on her neighbors (see Jer. 25:17-26; Hab. 1:5-17; 2:1-8; see on Jer. 25:12).