Quite often when I listen to different Bible Scholars discuss the Trinity in theology, they discuss how hard it is to grasp the concept of a God in three persons, Father, Son, and Holy Spirit. I may be overly simplistic, but I not only have no problem with the concept, but believe the God of the Bible could not be who he is without being three persons.
First, God, the Father. He is inside and outside of time and is all places at the same time. He knows when a sparrow falls from the sky, the number of the hairs on our head (not hard on me) and our every thought, and he knows every star by name. He is omniscient and omnipotent and omnipresent. He is God.
God, the Son. God became flesh and dwelled among us. God in person. He walked with Adam and Eve in the cool of the day, spoke to Moses through a bush, wrestled with Jacob, and lowered himself to be born a child, live a sinless life and go through the agony of dying on a cross for my sins, came back to life with a physical body able to show Thomas where he was pierce before eating with his apostles. As Jesus, the Son, walked with his disciples, ate with them and did miracles, he was God, but did God cease to be everywhere while he was walking on the Earth here? Not at all. God was still omnipresent while he was also right here in person.
God, the Spirit. When we invite God's spirit to dwell within us, his spirit works on us, convicting us when we sin. The spirit helps us understand scripture and comforts us when we go through hard times. God does not cease to be everywhere while he is inside us.
God must be in three persons or he could not be everywhere, right here walking with us in person, and living inside us at the same time. God would need to have three distinct personalities to accomplish this and to be the God described in the Bible.
