I start this series by laying 2 Foundations:
a) You need to understand this is a hard doctrine to comprehend. You need to be comfortable with how difficult it is.
b)You need to understand that the doctrine of the Trinity is a Christ-centered doctrine, meaning the Trinity reveals itself in Christ and we can only come to it through Christ.
Matthew 3: 13 – 17:
13 Then Jesus came from Galilee to the Jordan to John, to be baptized by him. 14 John would have prevented him, saying, “I need to be baptized by you, and do you come to me?” 15 But Jesus answered him, “Let it be so now, for thus it is fitting for us to fulfill all righteousness.” Then he consented. 16 And when Jesus was baptized, immediately he went up from the water, and behold, the heavens were opened to him,[a] and he saw the Spirit of God descending like a dove and coming to rest on him; 17 and behold, a voice from heaven said, “This is my beloved Son,[b] with whom I am well pleased.”