Christmas letters and Facebook posts focus on the positives in your lives, less so on the things we like to keep quiet. Pride leads us to take pleasure in having more than others or being cleverer or richer or better-looking than the next person.
Of course we recognise that this attitude is not ok for us as Christians but all too easily it creeps in. This passage in Philippians confronts this issue of pride head on and challenges us to seek humility modelled on Christ. It will impact our relationships with other people for good.