What is the Spirit of Truth?

The Holy Spirit consists of the truth.

"Jesus answered, My kingdom is not of this world: if my kingdom were of this world, then would my servants fight, that I should not be delivered to the Jews: but now is my kingdom not from hence. Pilate therefore said unto him, Art thou a king then? Jesus answered, Thou sayest that I am a king. To this end was I born, and for this cause came I into the world, that I should bear witness unto the truth. Every one that is of the truth heareth my voice." (John 18:36-37 KJV) 

"Pilate saith unto him, What is truth? And when he had said this, he went out again unto the Jews, and saith unto them, I find in him no fault at all." (John 18:38 KJV)

"Jesus saith unto him, I am the way, the truth, and the life: no man cometh unto the Father, but by me." (John 14:6 KJV)

"You are near, O Lord [nearer to me than my foes], and all Your commandments are truth." (Psalm 119:151 AMP) 

"Thy righteousness is an everlasting righteousness, and thy law is the truth." (Psalm 119:142 KJV) 

"Even the Spirit of truth; whom the world cannot receive, because it seeth him not, neither knoweth him: but ye know him; for he dwelleth with you, and shall be in you." (John 14:17 KJV) 

"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." (John 16:13 KJV) 

"Sanctify them through thy truth: thy word is truth." (John 17:17 KJV)

"Seeing ye have purified your souls in obeying the truth through the Spirit unto unfeigned love of the brethren, see that ye love one another with a pure heart fervently." (1 Peter 1:22 KJV)