The Prophets come into the world to guide and educate humanity so that the animal nature of man may disappear and the divinity of his powers become awakened. The divine aspect or spiritual nature consists of the breaths of the Holy Spirit. The second birth of which Jesus has spoken refers to the appearance of this heavenly nature in man. It is expressed in the baptism of the Holy Spirit, and he who is baptized by the Holy Spirit is a veritable manifestation of divine mercy to mankind. Then he becomes just and kind to all humanity; he entertains prejudice and ill will toward none; he shuns no nation or people
(Abdu’l-Baha, The Promulgation of Universal Peace, p. 41)
Spiritual progress is through the breaths of the Holy Spirit and is
the awakening of the conscious soul of man to perceive the reality
`Abdu’l-Baha: Promulgation of Universal Peace p.142-143 MARS
How shall we attain the reality of knowledge? By the breaths and promptings of the Holy Spirit, which is light and knowledge itself. Through it the human mind is quickened and fortified into true conclusions and perfect knowledge.
`Abdu’l-Baha:  Promulgation of Universal Peace pp.22-23 MARS
Through the faculty of meditation man attains to eternal life; through it he receives the breath of the Holy Spirit — the bestowals of the Spirit are given during reflection and meditation.
The spirit of man is itself informed and strengthened during meditation; through it affairs of which man knew nothing are unfolded before his view. Through it he receives divine inspiration, and through it he partakes of heavenly food.
Meditation is the key for opening the doors of mysteries. In that state man abstracts himself; in that state man withdraws himself from all outside objects; in that subjective condition he is immersed in the ocean of spiritual life and can unfold the secrets of things in themselves. To illustrate this, think of man as endowed with two kinds of sight: when the power of insight is being used the power of outward vision does not function.
(Compilations, Baha’i Scriptures, p. 323)
(b) The Love of God for His children. His servants.
Through this love man is endowed with physical existence,
until through the Breaths of the Holy Spirit-this
same Love-he receives eternal life and becomes the image
of the Living God. This love is the origin of all the
love in the world of creation.
(c) “The love of man for God. This is attraction to
the Divine World, entrance into the Kingdom of God,
receiving the Bounties of God, illumination with the
Lights of the Kingdom. This love is the origin of all
philanthropy; this love causes the heart of man to reflect
the rays of the Sun of Reality.
(Howard Colby Ives, Portals to Freedom, p. 110)
Let them at all times refresh and restore themselves with the dews of heavenly grace, and with the breaths of the Holy Spirit revive and renew themselves from moment to moment.
(Abdu’l-Baha, Selections from the Writings of Abdu’l-Baha, p. 10)