Little was known of Gabriel's extraordinary spiritual gifts during his life. He was not singular, he conformed himself to the community life; he was only a fervent and exemplary Passionist novice and student hidden fromthe world in the cloister. After death, this young religious in a few years was declared venerable by the Church, thereby testifying that he had practised all the virtues in a heroic degree; and he was beatified and raised to the honours of the altar, by special privilege of the supreme pontiff before he was fifty years dead.

His solemn beatification took place on 31 May, 1908, in the Vatican basilica, in the presence of the cardinals then in Rome, of the Passionist fathers resident in Rome and of representatives from all the provinces of the congregation. Among those present were many who had known the beatified during his life, including one of his brothers, Father Norbert, C.P., his old spiritual director and confessor and Signor Dominico Tiberi, who had been miraculously cured through his intercession.

The Mass and Office in honour of Blessed Gabriel are allowed to the whole Passionist congregation, and his feast day is celebrated on 31 May. It is the express wish of Leo XIII and Pius X that he should be regarded as the chief patron of the youth of today, and especially as the patron of young religious, both novices and professed, in all that concerns their interior lives.