"Through Him all things were made..."
This one line is the reminder of how much God has done and will do for us. That God created it all, and that God will continue to do so much for us.
"For us men and for our salvation, He came down from Heaven..."
Not only did God create us, but He (as the Son) came to us, fully human and divine, to live among us and bring us salvation. For those years, Jesus was just as human as we were, with the same needs and temptations we face each day.
"...and by the Holy Spirit, was incarnate of the Virgin Mary, and became Man."
This is the part where we bow, recognizing, as mentioned earlier, that Jesus was fully human and divine. Jesus never stopped being God, but bore the burdens of the flesh alongside us. He wasn't just God on earth, he was a human, incarnate with humanity, just like ours.
This section of the Creed reminds us that God truly understands the struggles we endure as humans and wanted us to succeed in achieving salvation, so much so that God sent Jesus to us, with us, and to suffer for us.