“But to us there is but one God, the Father, of whom are all things, and we in him; and one Lord Jesus Christ, by whom are all things, and we by him” (1 Cor 8:6).
“I am Alpha and Omega, the beginning and the ending, saith the Lord, which is, and which was, and which is to come, the Almighty” (Rev 1:8).
“Howbeit when he, the Spirit of truth, is come, he will guide you into all truth: for he shall not speak of himself; but whatsoever he shall hear, that shall he speak: and he will shew you things to come” (Jn 16:13).
“Blessed be God, even the Father of our Lord Jesus Christ, the Father of mercies, and the God of all comfort” (2 Cor 1:3).
“For there are three that bear record in heaven, the Father, the Word, and the Holy Ghost: and these three are one (1 For there are three that bear record in heaven, the Father, the Word, and the Holy Ghost: and these three are one” (1 Jn 5:7).
The Trinity does not make since to us, it even seems farfetched and impossible, and for us it is. Yet, nothing is impossible for God.
“For with God nothing shall be impossible” (Lk 1:37).
The Trinity is one of them things which we are not to comprehend fully:
“And he said unto them, It is not for you to know the times or the seasons, which the Father hath put in his own power” (Act 1:7).
But we are to accept it in faith.
“Now faith is the substance of things hoped for, the evidence of things not seen.
But without faith it is impossible to please him: for he that cometh to God must believe that he is, and that he is a rewarder of them that diligently seek him” (Heb 11:1 & 6).