Bahá’u’lláh explained that although the universe has always existed it is contingent upon the essential preexistence of God.
”The world of existence is contingent, inasmuch as it is preceded by a cause, while essential preexistence hath ever been, and shall remain, confined to God, magnified be His glory. This statement is being made lest one be inclined to conclude from the earlier assertion, namely that creation hath no beginning and no end, that it is preexistent. True and essential preexistence is exclusively reserved to God, while the preexistence of the world is secondary and relative. All that hath been inferred about firstness, lastness and such hath in truth been derived from the sayings of the Prophets, Apostles, and Chosen Ones of God’.