How do we know who the Holy Spirit is? We do not hear the Spirit speak in the same way that God the Father or God the Son have spoken, yet its presence is equally here.
When Christ entered heaven, he took something with him: a human nature forged by the story of our striving and suffering. When Christ became man, God entered human history. When Christ returned to his Father, human history entered God.
My sister, who has Down syndrome, never had dolls that looked like her growing up. Today, my kids can play with a Barbie who has Down syndrome, which allows all children to welcome people with disabilities.