Things of the Spirit by T Austin-Sparks and published by Classics.
It is common knowledge that God has arranged the course of this world's history in what we call ages or dispensations, which simply means that at certain different times a particular distinguishing, character is given to the period. There were the past dispensations, which had their own character and nature and regime. There will be future dispensations, called in the New Testament “the ages of the ages”; they, again, will have their own special characteristics. We ourselves, at the present time, are in one of these particular arrangements of God.
It is also common knowledge that the advent of the Holy Spirit, on that particular occasion which has come to be known as ‘The Day of Pentecost’, marked a change in the nature of the ages. That day saw a change of dispensations. That day brought in the dispensation in which we still live, which has its own particular and peculiar characteristics, different from all the others.