The holiness of the church universal should make us take our membership in local congregations seriously. Were we to be convinced of the church’s holiness, we would not casually drift from one denomination to another. We would understand that to leave a church for reasons other than doctrine, distance, or to accept a call to service manifests a questioning of that church’s holiness, which is something we must not do lightly if God has said His church is holy.
For further study:
The Bible in a year: