Angels are also those holy souls who have severed attachment to the earthly world, who are free from the fetters of self and passion and who have attached their hearts to the divine realm and the merciful kingdom.
(‘Abdu’l-Bahá, Bahá’í World Faith, p. 409)
On the other hand, the divine reality is unlimited and immeasurable and can never stop or deteriorate, therefore the holy souls who are confirmed with this divine power are likewise endowed with eternal motion. Their progress becomes unlimited. Day unto day their lives are strengthened, the circle of their comprehension becomes wider, the sphere of their intellects becomes more effectual and their capacities are increased. I desire for you that ideal power, so that you may come into the stream of uninterrupted motion and never cease progressing. Day unto day may you inherit eternal qualities, so that you may continue to travel along all the infinite degrees of human and divine attainments.
(‘Abdu’l-Bahá, Divine Philosophy, p. 125-126)
… with sincere intentions, good designs, useful advices, divine moralities, beautiful actions, spiritual qualities, educating the public, guiding the souls of mankind, diffusing spiritual fragrances, explaining divine illustrations, showing convincing proofs and doing charitable deeds. When the holy souls, through the angelic power, will arise to show forth these celestial characteristics, establishing a band of harmony, each of these souls shall be regarded as one thousand persons and the waves of this greatest ocean shall be considered as the army of the hosts of the Supreme Concourse.
(‘Abdu’l-Bahá, Bahá’í World Faith, p. 401)
… and the holy souls who obeyed Him in all circumstances …
(‘Abdu’l-Bahá, Bahá’í World Faith, p. 334)