Dear Prestor John,
The New Geneva Study Bible notes on Prayer (at Luke 11:2) has this:
As with the other aspects of prayer, petitions should ordinarily be directed to the Father, as the Lord's Prayer shows, but prayer may be directed to Christ, as in the days of His incarnation (Rom. 10:8-13; 2 Cor.12:7-9), and to the Holy Spirit (Rev. 1:4).
The
in the days of His incarnation is helpful to me: the instances of people petitioning Christ directly do not seem to have been rebuked on that account, and it is hard for me to conceive the Lord
not rebuking petitioners for addressing Him directly, if such prayer were indeed proper only if addressed to the Father. The NT pattern is, of course, predominantly that of addressing the Father, but there does not seem to be a
forbidding of prayer to the other members of the Godhead.
WCF XXI seems to leave the door open for this as well. Following II: [color:blue]Religious worship is to be given to God, the Father, Son and Holy Ghost;, III defines
prayer, with thanksgiving to be [color:blue]one special part of religious worship, and in the requirements which follow, [color:red]addressing the Father alone does not appear. If
being worshipped is accepted by each member of the Trinity, is one right to imply that
being addressed in prayer will be rejected by Christ and the Holy Spirit?