According to the teachings of Islam, one should look at someone's speech to recognize him and to know what he says and if it is worthy or not, as God has said: "Those Who listen to speech and follow the best of it. Those are the ones Allah has guided, and those are people of understanding" (Az-Zumar, 18).
This is why "Allamah Mansoor Hashemi Khorasani" wants everyone to hear his speech, as he says: "Hearken to my speech and do not ask who I am; Since the identity of human will be revealed by his speech and the wise will look at the speech and not to the speaker!" (source: Letter number 1). So, if you want to recognize him, read his speeches gathered in the following website.