He continually had dreams and visions, which increased in frequency after the public appearance of Sabbataï at Smyrna and Constantinople. He communicated his delusion to his wives and domestics, who likewise pretended to have seen all sorts of apparitions. The apostasy of the false Messiah from Judaism did not cure Cardoso of his delusion; he remained a zealous partisan, and even justified the treachery of the Messiah by saying that it was necessary for him to be counted among sinners, in order that he might atone for Israel's sin of idolatry, and blot it out. He sent circulars in all directions, in order to support the Messianic claim of Sabbataï, and figure as a prophet. In vain his more sober brother, Isaac Cardoso, warned and ridiculed him, asking him ironically, whether he had received the gift of prophecy from his former gallantries and from playing the guitar for the fair maidens of Madrid. Abraham Cardoso's frivolity was in no way lessened, he even assumed a didactic tone towards his grave elder brother, who despised the Kabbala as he did alchemy and astrology, and sent him numberless proofs, from the Zohar and other Kabbalistic writings, that Sabbataï was the true Messiah, and that he must necessarily be estranged from Judaism. By his zeal he gained many adherents for the Sabbatian delusion in Africa; but he also made enemies, and incurred dangers. He continued to prophesy the speedy commencement of the Messiah's reign, although often proved false by reality. He put off the event from year to year, performed Kabbalistic tricks, set up a new God for Israel, and at last declared himself the Messiah of the house of Ephraim, until he was rigorously prosecuted by an opponent of these vagaries. Cardoso was driven back to his former uncomfortable position, forced to lead an adventurer's life, and win bread for himself and his family, so to speak, by his delusions, going through all sorts of jugglery, at Smyrna, at Constantinople, in the Greek islands, and at Cairo, and promoting the Sabbatian delusions with his abundant knowledge, eloquent tongue, and ready pen. Thanks to his education in Christian schools, he was far superior to other Sabbatian apostles, and knew how to give an air of rationality and wisdom to nonsense, thus completely blinding the biased, and stultifying even those averse to the Sabbatian movement.