Tertullian

31 treatises and various lost works. He coined the term "Trinity" which in Latin is "Trinitas", thus allowing the Church to adopt a more popular simple term rather than the older terms of Triados or Triad or Trias, and the long expressions of adjectives with nouns, "the grace of our Lord Jesus Christ and the love of God and the communion of the Holy Spirit" or "the God, his Logos, and his Sophia", etc. "there are three which bear testimony in heaven, the Father, and the Word, and the Holy Spirit, and these three are one." or the Epistle of Barnabas very long expression from chapter 5: "if the Lord endured to suffer for our soul, He being Lord of all the world, to whom God said at the foundation of the world, 'Let us make man after our image, and after our likeness,' understand how it was that He endured to suffer at the hand of men. The prophets, having obtained grace from Him, prophesied concerning Him. And He (since it behooved Him to appear in flesh), that He might abolish death, and reveal the resurrection from the dead, endured [what and as He did], in order that He might fulfil the promise made unto the fathers, and by preparing a new people for Himself, might show, while He dwelt on earth, that He, when He has raised mankind, will also judge them. Moreover, teaching Israel, and doing so great miracles and signs, He preached [the truth] to him, and greatly loved him. But when He chose His own apostles who were to preach His Gospel, [He did so from among those] who were sinners above all sin, that He might show He came not to call the righteous, but sinners to repentance. Then He manifested Himself to be the Son of God."