Shaykh Ahmad diverged from the Usuli school on key issues related to eschatology, the role of the ulama, and the proper interpretation of the mystical hadith of the Twelve Imams. These divergences, according to Bahá'í scholar Peter Smith, resulted in accusations of heresy from orthodox members of the Shia ulama, and instances of persecution against Ahsá'í and his followers occurred during and after his lifetime. His teachings were complex, thus he often practiced "Taqayya" concealing his controversial ideas from his opponents.