Likutei Moharan, Part II 61:2/ליקוטי מוהר"ן·תנינא ס״א:ב׳

12. Therefore, Mashiach, who has endured what he has endured ever since the creation of the world, and suffered what he has suffered, after all this, God will in the end say to him: “You are My son. I gave birth to you this day” (Psalms 2:7).

2At first glance this matter is very perplexing and amazing. However, it is all due to the great power of Mashiach’s intellect. According to the great level he will have grasped then, and on account of the tremendous power of his intellect which will increase immensely then, all the time which passed from the creation of the world till that time will literally be totally non-existent and naught. It will be exactly as if he was born that day. All of time will be nullified within his intellect, which will be extremely great. Therefore, God will say to him: “I gave birth to you this day”—literally, “this day,” because all the time which passed will be utterly non-existent and naught.