The “divine Spirit giveth life to the souls and conferreth eternal life upon those who are attracted to the fragrances of God.”

O maid-servant of God! The human spirit hath an impression and effect in the world, but the divine Spirit giveth life to the souls and conferreth eternal life upon those who are attracted to the fragrances of God. This is the Great Cause from the Kingdom of thy Lord. Be attached to this New Spirit which hath effective power in the realities of things and creates new creatures. 

- ‘Abdu’l-Baha  (‘Tablets of ‘Abdu’l-Baha, vol. 1)

The human spirit needs the assistance of the Holy Spirit to “uncover realities, and unravel mysteries”

The human spirit possesseth wondrous powers, but it should be reinforced by the Holy Spirit. What thou hearest other than this is pure imagination. If, however, it be assisted by the bounty of the Holy Spirit, then will its strength be a thing to marvel at. Then will that human spirit uncover realities, and unravel mysteries. Turn thy heart fully to the Holy Spirit, and invite others to do the same; then shall ye witness wonderful results. 

- ‘Abdu’l-Baha  (‘Selections from the Writings of ‘Abdu’l-Baha’)

Stations of believers in the next world

Question: Will the stations of the believers continue to be different hereafter? 

'Abdu'l-Baha answered, "Yes, it will be necessarily so, for the Kingdom requires it. 

"The King appoints one to be his prime minister, another to be his greatest general, another a soldier, and so on from the highest to the lowest. If all were generals or all were soldiers, there would be no kingdom. 

"God created the mineral, the vegetable, the animal, and man. Had He created only man there would be no world."

- 'Abdu'l-Baha  (Words of ‘Abdu’l-Baha, recorded by Helen Goodall and Ella Goodall Cooper during their pilgrimage in 1908; ‘Daily Lessons Received at Akka January 1908’)

How a human soul can “obtain everlasting life”

The Book of God is wide open, and His Word is summoning mankind unto Him…No man can obtain everlasting life, unless he embraceth the truth of this inestimable, this wondrous, and sublime Revelation.

- Baha’u’llah  (‘Gleanings from the Writings of Baha’u’llah’)