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The Spirit of Truth, when He comes, will bring all things to your remembrance whatsoever God has spoken to you.
John 14
25 These things have I spoken unto you, being yet present with you.
26 But the Comforter, which is the Holy Ghost, whom the Father will send in my name, he shall teach you all things, and bring all things to your remembrance, whatsoever I have said unto you.

What you remember actually seeing and hearing is your most accurate source of truth and is admissible in a court of law.
Hence, your memory is your most reliable source of information and truth.
Philippians 4
8 Finally, brethren, whatsoever things are true, whatsoever things are honest, whatsoever things are just, whatsoever things are pure, whatsoever things are lovely, whatsoever things are of good report; if there be any virtue, and if there be any praise, think on these things.
9 Those things, which ye have both learned, and received, and heard, and seen in me, do: and the God of peace shall be with you.

Therefore whatsoever the Holy Ghost brings to your remembrance is true and you have become a witness to the truth and the truth will set you free.
1 John 5
7 For there are three that bear record in heaven, the Father, the Word, and the Holy Ghost: and these three are one.
8 And there are three that bear witness in earth, the Spirit, and the water, and the blood: and these three agree in one.
9 If we receive the witness of men, the witness of God is greater: for this is the witness of God which he hath testified of his Son.

What you hear others say is hearsay but what you see with your own eyes and hear with your own ears is admissible in a court of law and before the court of Heaven.
Anything you say based on what others have said is inadmissable in courts of law and the court of Heaven.
1 Timothy 4
6 If thou put the brethren in remembrance of these things, thou shalt be a good minister of Jesus Christ, nourished up in the words of faith and of good doctrine, whereunto thou hast attained.
7 But refuse profane and old wives' fables, and exercise thyself rather unto godliness.
8 For bodily exercise profiteth little: but godliness is profitable unto all things, having promise of the life that now is, and of that which is to come.

Brethren, you must be a first hand witness of the things of God to be His witness.
John 3
10 Jesus answered and said unto him, Art thou a master of Israel, and knowest not these things?
11 Verily, verily, I say unto thee, We speak that we do know, and testify that we have seen; and ye receive not our witness.
12 If I have told you earthly things, and ye believe not, how shall ye believe, if I tell you of heavenly things?