God the Holy Spirit
Image credit Walking along the shore, a man saw a boy scooping water from the sea with his bare hands and then running towards a hole in the sand to dump the water. After watching him do it a few times, he asked the boy, “What are you doing?” He replied with a determined smile, “I’m trying to put the sea into that hole.” It’s the same when we study the doctrine of the Trinity. This led a theologian to quip, “He who tries to understand the Trinity fully will lose his mind; but he who denies it will lose his soul.” People who deny the doctrine use the simplistic argument that the word “Trinity” is not in the Bible. But they are not consistent. They use other terms that are not scriptural also, too, such as “omniscient” (“God is all-knowing”). Though admittedly the term itself is not found in it, the teaching on the Trinity is actually in the Bible. The term “is used to summarize the teaching of Scripture that… God eternally exists as three persons, Father, Son, and Holy Sp