By showing them the TRUTH that's how.
The truth cannot disappear. Only a lie can disappear. TRUTH is forever present right here, right now.
TRUTH can extinguish lie. But LIE can never extinguish TRUTH - because truth is all there is. Lie is a false secondary reality upon Truth.
Knowing anything at all, is a false secondary reality upon this immediate true and real not-knowing being.
If you say you know...you don't.
There is only now. Nothing knows now. Nothing can only be now.
Be-now doesn't become. Now is never from some past, or heading toward some future. NOW is completely still. Always here, right now. Nowhere.
Now is silent, still, unmoving, timeless, unknowing, perfection.
Knowing on the other hand, is solipsism. Let that sink in. Solipsism is the realisation that 'knowing' is everything, and nothing, happening all at once. One without a second. You are this 'knowing' one without a second.
Time is what stops everything, everywhere, from happening all at once, time is this dream (artificially relative to the absolute) time and space is the dream of separation. Outside of which there is NOTHING
There is here now, only the absolute, eternal, totality, infinity, singularity. A.K.A. ( GOD )
If you know you exist, you exist only as a moving fictional character, as a dream in the mind of God, another word for infinite mind.