Those souls who have the capacity and ability to receive the outpourings of the Kingdom and the confirmation of the Holy Spirit, they become attracted through one word. But people who 365 have not the capacity, no matter how much one explain the divine behests and advices or breathe the breath of the Holy Spirit, it will not make an effect; nay, rather they add to their hardness and heedlessness.
No sooner is the oil touched by fire than it is ignited, but the heat of the fire will not make any effect upon the black stone.
Now praise be to God that thou didst have a pure aim and great capacity so that as soon as thou didst hear the “Word” thou didst become attracted. Indeed this is one of the most great gifts of God.
(Abdu’l-Baha, Baha’i World Faith – Abdu’l-Baha Section, p. 364)