From the Catechism of the Catholic Church, Simplified
His Almighty Power (268-269)
Of all God's attributes, the Creed speaks only of his almighty power. This power is universal (creating and ruling everything), loving, and mysterious (known only by faith).
God is the "Mighty One of Jacob" (Gen 49:24). "Whatever God wills is done" (Ps 115:3). He can do everything in heaven and earth. He is the Lord of the universe governing all events by his will.
A Fatherly Care (270-271)
God's almighty power is also fatherly. "I will be a father to you, and you shall be my sons and daughters" (2 Cor 6:18). God's power is not arbitrary. "Nothing can be in God's power which could not be in his just will or his wise intellect" (St. Thomas Aquinas).
God's Mysterious Ways (272-274)
In our trials God does seem to be absent and powerless. However. God's power is fully revealed in the death and Resurrection of Jesus. "For the foolishness of God is wiser than men, and the weakness of God is stronger than men" (1 Cor 1:24-25). In Jesus' death and Resurrection, God has revealed the "immeasurable greatness of his power in us who believe" (Eph 1:19-22).
Only faith can embrace these mysterious ways of God's power. Mary believed the angel's words that "nothing will be impossible with God" (Lk 1:37) and she proclaimed that "he who is mighty has done great things for me" (Lk 1:49). Knowing that nothing is impossible for God, we can accept everything in the Creed without any hesitation.