What is the Trinity
Harold Lindsell and Charles J. Woodbridge's, A Handbook of Christian Truth are quoted saying, "the mind of man cannot fully understand the mystery of the Trinity. He who has tried to understand the mystery fully will lose his mind; but he who would deny the Trinity will lose his soul.
The doctrine of the Trinity will probably be argued about until we are face to face with our Savior. This may be because our finite minds can't comprehend an infinite God (as loosely phrased from the above quote). But until then, my desire is to meet people where they are, give scripture in context, and allow the Holy Spirit to illuminate truths in their hearts and minds.
You may be wondering where the word “Trinity” is in the bible. You won't find it, but you also won't find the word "Bible" in the bible either. It was coined by Tertullian in the first century, who was an early Christian author and apologist who produced extensive work in Latin literature.
Trinity- comes from the Latin word Trinitas, lit. 'triad', from trinus, "threefold". Theologically speaking it means there is one God, who eternally exist as three distinct persons: Father, Son, and Spirit.
Below is scripture for both of these claims:
1. There is only one God
Monotheism is the belief there is only one God, which is the universal view of Christianity. Polytheism is the belief in two or more gods (cf. Acts 17). The doctrine of Trinity is a Christian belief, so it cannot adhere to polytheism.
Deuteronomy 6:4; 32:39; 1 Chronicles 17:20; Nehemiah 9:6; Psalms 18:31; 86:10; Isaiah 44:6,8; 45:5; 46:9; Joel 2:27; Zechariah 14:9; Mark 12:29-34; John 17:3; Romans 3:30; Galatians 3:20; Ephesians 4:6; 1 Timothy 1:17; 2:5; James 2:19
2. Three persons: Father, Son, Spirit
John 1:1; 6:27; Romans 1:7; 1 Corinthians 8:4-6; 1 Peter 1:2
Son, Jesus Christ
John 1:14; 8:56-59 (Cf. Exodus 3:14); 20:28; Colossians 1:16; 2:9; Titus 2:13; 1 John 5:20
Genesis 1:2; Acts 5:3-4; 7:51; 2 Corinthians 3:17-18; Ephesians 4:30; Hebrews 10:29
Examples of His eternal existence in creation:
Genesis 1:1, 26; 3:22; 11:7; Isaiah 6:8; Matthew 28:19; Luke 1:35; 3:21-22; Acts 1:7-8; 2 Corinthians 13:14; 1 Peter 1:2