Paliggenesia (G3824) appears only twice in the NT. In Matthew 19:28 Jesus uses it for the cosmic renewal of all creation at the consummation — 'the renewal [paliggenesia] of all things when the Son of Man sits on his glorious throne.' In Titus 3:5 Paul uses it for individual spiritual rebirth — 'He saved us through the washing of rebirth [paliggenesia].'
The word carries Stoic philosophical background (the renewal of the cosmos after destruction) but Paul and Jesus baptize it with new meaning: the same Greek word covers both personal regeneration and cosmic restoration. The individual new birth is a foretaste and first-fruit of the ultimate paliggenesia — when all creation is made new. Personal salvation is not just about individual souls but about the renewal of everything.