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’)