The after-Pentecost teaching, that is the personal relation to the Spirit by one who has received Him to-day, may best be learned from the epistles. Paul's letters form the bulk of the New Testament after the Book of Acts is passed. They contain the Spirit's _after-teaching_ regarding much which the disciples were not yet able to receive from Jesus' own lips. They were written to churches that were far from ideal. They were composed largely of people dug out of the darkest heathenism. And with the infinite patience and tact of the Spirit Paul writes to them with a pen dipped in his own heart. A rather careful run through these thirteen letters brings to view two things about the relation of these people to the Holy Spirit. First there are certain _allusions_ or references to the Spirit, and then certain _exhortations_. Note first these _allusions_.[28] They are numerous. In them it is constantly _assumed_ that these people _have received the Holy Spirit_. Paul's dealing with the twelve disciples whom he found at Ephesus[29] suggests his habit in dealing with all whom he taught. Reading that incident in connection with these letters seems to suggest that in every place he laid great stress upon the necessity of the Spirit's control in every life. And now in writing back to these friends nearly all the allusions to the Spirit are in language that _assumes_ that they have surrendered fully and been filled with His presence. There are just four _exhortations_ about the Holy Spirit. It is significant to notice what these are not. They are not exhorted to seek the baptism of the Holy Spirit nor to wait for the filling. There is no word about refillings, fresh baptisms or anointings. For these people, unlike most of us to-day, have been thoroughly instructed regarding the Spirit and presumably have had the great radical experience of His full incoming. On the other hand notice what these exhortations _are_. To the Thessalonians in his first letter he says, "_Quench not_ the Spirit."[30] To the disciples scattered throughout the province of Galatia who had been much disturbed by false leaders he gives a rule to be followed, "_Walk_ by the Spirit."[31] The other two of these incisive words of advice are found in the Ephesian letter--"_Grieve not_ the Spirit of God,"[32] and "_be ye filled_ with the Spirit."[33] These exhortations like the allusions assume that they have received the Spirit, and know that they have. The last quoted, "be ye filled," may seem at first flush to be an exception to this, but I think we shall see in a moment that a clearer rendering takes away this seeming, and shows it as agreeing with the others in the general teaching.