Communion with God.
When Christians meet, they talk to each other about their Christian work and Christian interests, their Christian acquaintances, the state of the churches, and the problems of theology—but rarely of their daily experience of God.
Modern Christian books and magazines contain much about Christian doctrine, Christian standards, problems of Christian conduct, techniques of Christian service—but little about the inner realities of fellowship with God.
Our sermons contain much sound doctrine—but little relating to the converse between the soul and the Saviour.
We do not spend much time, alone or together, in dwelling on the wonder of the fact that God and sinners have communion at all; no, we just take that for granted, and give our minds to other matters.
Thus we make it plain that communion with God is a small thing to us.
(J.I. Packer via Justin Taylor)