Revelation Apart from God's word?

I want to pose a question. It's been one I have been wrestling with for quite a while :is their revelation apart from God's word? When people say they hear from God do they really? Is there any measure by which to discern whether these are true or not?

Piper has these words to say:

The great need of our time is for people to experience the living reality of God by hearing his word personally and transformingly in Scripture. Something is incredibly wrong when the words we hear outside Scripture are more powerful and more affecting to us than the inspired word of God. Let us cry with the psalmist, “Incline my heart to your word” (Psalm 119:36). “Open my eyes, that I may behold wondrous things out of your law” (Psalm 119:18). Grant that the eyes of our hearts would be enlightened to know our hope and our inheritance and the love of Christ that passes knowledge and be filled with all the fullness of God (Ephesians 1:18; 3:19). O God, don’t let us be so deaf to your word and so unaffected with its ineffable, evidential excellency that we celebrate lesser things as more thrilling, and even consider this misplacement of amazement worthy of printing in a national magazine.

I think his words are very wise we should never elevate the extraordinary over the ordinary because God does far surpassing things with ordinary vessels, it gives God more glory that way. May we all be the greatest contradictions to what we should be by the world's standards.

You can check out the rest of the Piper article here

To His Glory alone,
JG