How do we know the definition of 'world' in John 3:16 is true?

To ascertain the meaning of 'world' in John 3:16, one must engage with the broader context of Scriptures that discuss God's love and the recipients of Christ's atoning sacrifice. The term 'kosmos' is employed in various ways throughout the New Testament, and a careful examination reveals its application in John 3:16 aligns with the theological assertion that God loves His elect—those chosen before the foundation of the world (Ephesians 1:4). This focused love contrasts sharply with common interpretations that suggest an unconditional love for all humanity without distinction.

Moreover, examining parallel passages sheds light on this interpretation. In Romans 5:8, God's love is directed towards His saints, confirming that the intention behind Christ's sacrifice is for believers specifically. Thus, iterating that 'world' in this context cannot simply be interpreted as everyone universally. Instead, the faithful hermeneutics uphold that the understanding of 'kosmos' as the world of believers is indeed true and aligned with the historic Reformed perspective on grace and redemption.