本文試圖從拉庫娜的三一論中，探討「位格」在神學的重要性。拉庫娜認為，三一上帝的位格，是直接建基於上帝與他者的關係裡，三一教義最終是基督徒生活中的一種實用、位格的教義。拉庫娜堅持上帝的三一思想是一種關係性的三一，她認為：「三一上帝，即便是居住在不可見的真光中，這位不可見的上帝，仍透過可見聖像耶穌基督，真實的以人的性格，接觸人類的歷史，三一是個難以形容的奧秘。」拉庫娜強調，這不單是神學原理，而且是基督徒真實生活體現的位格，確切將上帝的讚美源於經世，並傳到內在去。拉庫娜的三一論使拯救論對上帝神學具備著決定性的作用。她並沒有把位格的三一放逐到一個與被造者無關的神學領域，而是將位格置於關係、共融中。她詮釋位格的定義，提出上帝位格不是自足、自負、自我吸收，而是一種「走出自我」與被造者的聯合的外在渴望。因此，上帝神聖生命在基督、聖靈裡與我們的共融，她認為共融是充分反應上帝三一位格的實用教義。拉庫娜對三一論的結論是：「上帝內在神學與拯救論是無法分開，反之亦然。」儘管如此，拉庫娜的三一思想過於強調上帝經世共融，且不能與歷史作一區分，以至於上帝內在實質的重要性被弱化，引起傳統三一思想的失衡。這篇文章將重新思考拉庫娜的三一論思想，這需要更廣泛和建設性的神學審查，進一步反思上帝的內在實質。儘管如此，她對位格共融的非凡貢獻，對基督徒的生活確實有實踐性意義，也喚醒當代三一論神學的活力。

This article explores the importance of “persons” in Catherine Mowry LaCugna's trinitarian theology. LaCugna believes that the personhood of the trinitarian God is directly grounded in God's relationships with others, and that the doctrine of the trinity is ultimately a practical, even personal, doctrine for Christian life. LaCugna insists on a relational trinity as, in her words: “Even though God dwells in light inaccessible, Christ is the visible icon of the invisible God, making tangible within human history and within human personality the ineffable mystery of God.” LaCugna stresses that it is not only a theological principle, but is reflected in a true Christian life to bring God's praise to the outward world (oikonomia) as it spreads it from within (theologia). LaCugna's trinity makes soteriology decisive for any theology of God and does not banish the trinity of persons to a mere intra-divine sphere unrelated to the personhood of the creature to put persons in relationship, that is, communion. She defines and proposes that the person of God is not self-contained, egotistical or self-absorbed, but includes an “ecstatic” outreaching desire for union with all creatures. Communion in the divine life is God's communing with us in Christ and as Spirit. Communion for her more fully reflects a living, practical doctrine of trinity. LaCugna's concludes: “Theology is inseparable from soteriology, and vice versa.” However, because LaCugna's trinity overemphasizes the oikonomia and cannot always be distinguished from history, it leads to the weakened importance of theologia and consequentially causes an imbalance in traditional trinitarianism. This article will re-consider LaCugna's trinitarian thinking in search of a solution that requires a more wide-ranging and constructive theological review further reflecting on God's inner substance. Nonetheless, her extraordinary contributions on the person in communion truly carries practical implications for Christian life and also revitalizes contemporary trinitarian theology.