(Consider this an add-on to the previous post.)
To the lost man, earthly (including demonic) reasoning is his revelation. But to the found man, heavenly revelation must evermore become his reasoning – and not merely his reasoning in the mind; but that upon which he acts in faith, which is the substantiation of things hoped for. Revelation bearing no fruit in action has been received in vain. It is those who honor the gift of God through obedience that continue receiving more of His fullness; for those who truly know Him desire nothing less than that He be glorified in the fruit of His labors within them.
And we are His witnesses of these things, and also the Holy Spirit, whom God gave to those obeying Him.
Acts 5:32 (LITV)
A witness is one who has heard, seen, looked upon and touched the Word of Life.