21.For whom else does Paul request prayer and supplication in the Spirit?

For himself.

Every saint who is on the firing line in the service of the Lord knows how greatly he is strengthened spiritually when there are Christians praying for him. One of the most important ministries in the Body of Christ is that of prayer for those who are preaching and teaching the Gospel. The need for prayer support for Christian leaders seems to be greater than ever in the present hour.