Keep in Step with the Spirit

I read JI Packer 's Keep in step with the Spirit this morning.It's a new version I received two days ago.

Four key words started the first chapter in his description of the Spirit's work among Christians.

Power,Performance,Purity& Presentation

Power ! How's our inner energy today ?
Performance ! How's our outward witness today ?
Purity ! How's our inner sanctity today ?
Presentation ! How's our outward example today ?

All His presence and programs are resulted from these!