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And when the day of Pentecost was fully come, they were all with one accord in one place. 

... And they were all filled with the Holy Ghost, and began to speak with other tongues, as the Spirit gave them utterance.

The Holy Bible, KJV, Acts 2

His students then received the Holy Ghost. By this is meant, that by all they had witnessed and suffered, they were roused to an enlarged understanding of divine Science, even to the spiritual interpretation and discernment of Jesus’ teachings ...After gaining the true idea of their glorified Master, they became better healers, leaning no longer on matter, but on the divine Principle of their work. The influx of light was sudden. It was sometimes an overwhelming power as on the Day of Pentecost.

Science and Health by Mary Baker Eddy, pg. 46-47