The phenomenal effect of "one pure breath" drawn by a person in a “state of severance”

On the way ‘Abdu’l-Bahá spoke about teaching the Cause of God in America and remarked:

In this country it is essential to have teachers who are attracted, wholly severed and learned like some of the self-sacrificing Persian teachers. The Cause of God must become firmly established in these regions. The teachers must move continually, one after another, from one place to another to raise the divine call. Then will the confirmations of the Abha Kingdom envelop these nations and wonders will be achieved. This desire of mine has not yet come about. It depends on the confirmations of the all-glorious Kingdom and on the sanctified breaths of the friends. The one true God is my witness! If a person draws only one pure breath in a state of severance, it will be effective for a thousand years.