Gabriel da Costa, in spite of his punctilious ecclesiasticism, did not feel quieted in his conscience. Daily mechanical exercises failed to influence his mind, and continual confession to obtain absolution from the lips of the priest pleased him less as he became more mature. Somewhat of the subtle Jewish spirit remained in his nature, and shook the strongly built Catholic system of belief to its foundations. The more deeply he plunged into the Catholic Jesuitic teaching, the more did doubts trouble him, and disturb his conscience. However, he accepted a semi-ecclesiastical office as chief treasurer to an abbey about 1615. To end his doubts, he investigated the oldest records of Holy Scripture. The prophets were to solve the riddles which the Roman Catholic Church doctrines daily presented to him. The fresh spirit which breathed from out of the Old Testament, disfigured though it was in its Latin guise, brought repose to his mind. The doctrines of Judaism appeared the more certain, as they were recognized by the New Testament and the Church, while those of Catholicism were rejected by Judaism; in the one case there was unanimity, in the other, contradiction. Da Costa formed the resolution to forsake Catholicism and return to Judaism. Of an impulsive, passionate temperament, he sought to carry his resolution into effect quickly. With great caution he communicated his intention to his mother and brothers--his father was already dead--and they also resolved to expose themselves to the danger of secret emigration, to leave their hearth and home, give up a respected position in society, and exchange the certain present for an uncertain future. In spite of the Argus-eyed espionage of Marranos by the Inquisition and the secular authorities, the Da Costa family succeeded in gaining a vessel and escaping to Amsterdam (about 1617-18). Gabriel da Costa and his brothers were admitted to the covenant of Abraham, and Gabriel changed his name to Uriel.