Why is it that you two put forth a challenge for believers to speak in tongues at your command, which in fact, it is the Spirit giving the utterance unto our spirit? How audacious, wouldn't you consider it to be? This is likened to you practically saying, "Spirit give them words so that I may see if your gift is genuine." Believers do not seek, nor do they need, your validation.
What seems audacious to me is the claim that a sign gift that was clearly intended for those unbelievers present at pentecost (hearing in their native tongues) is today being hailed as a sign for those who supposedly believe. Why would a believer desire "self-edification" if he truly already believes and trusts in his own salvation ? Being validated was never an issue for the believers present at pentecost. But it certainly was validated by the hearing of those who weren't believers. You personally may not "need" validation from anybody. But if an unbeliever is not validated (convicted) by what you claim and practice, it is not serving God's intended purpose. Audacious, don't you think ?