This work consists of four research papers concerning key themes in systematic, biblical and moral theology. The first paper, entitled “The Interiority of the Heart: Witnessing to the Trinitarian Unity in Diversity in the Church”, proposes a kind of theology of unity-in-diversity. The second essay, “Bo’az: A Heart for the Migrants”, is a reading of the Book of Ruth with special characterization of Bo’az. The third essay, “Jesus as the Gate in John 10:1-21”, unveils the significance of Jesus as the gate or the door through which the sheep come together as one under the Shepherd, Jesus himself, and thus enriches the Christological nuance of John 10:1-21. The fourth essay is entitled “The Church’s View on Women and Its Impact on Women’s Right to Migrate and the Migration Experience of Filipina Domestic Workers.” This essay discusses the contribution of the Church in upholding people’s right to migrate and its correlated rights, and poses a challenge as well to the Church to re-evaluate her views on women that perhaps contribute to the burden of shame, guilt or sinfulness and a distorted sense of “martyrdom” among migrant women.