"As for the extraordinary operations of the Holy Ghost, such as working of miracles, or speaking with divers kinds of tongues, they are long since ceased"

This quote by George Whitefield is describing the amazing operations of the Holy Ghost, such as working of wonders or speaking to various sort of tongues. Whitefield is recommending that these operations are no longer happening. This could be interpreted as an indication that the Holy Ghost is no longer actively associated with the world, or that the power of the Holy Ghost has actually been reduced. It might likewise be interpreted as a sign that the world has actually carried on from the requirement for such remarkable operations, which the power of the Holy Ghost is now found in more subtle methods. Whitefield's quote could be seen as a pointer that the power of the Holy Ghost is still present, even if it is not as noticeable as it when was.