to the end that you should walk worthily of God, who calls you into his own Kingdom and glory.
Calleth ... indicates not only that the kingdom is a present reality, but that the door is still open for all who wish to enter.  It is a mistake to read this as saying that Paul expected the "glory" phase of the kingdom to start any day and that God was calling the Thessalonians into that! Nevertheless, that is exactly the way some have misconstrued it.  Mason was right in the affirmation that: