The Ego is a result of the past; without past there is no self-producing thought-activity. Without the historical background, without this limitation, there is no such thinking. But the thinking, which is a result of the past, can, as Kierkegaard said, not understand the present, since it only uses the present as a passage to the future.
The future is always a becoming. The present is therefore never seized, though the understanding exclusively is lying herein. You can´t be present in the Now through the thinking´s past and future. This you only can meditative-existential; that is: when you are yourself, and the surroundings, present in passive listening.