Jesus introduces a radical idea: the ability to live without marriage isn't just a choice, but a special gift from God.
Jesus makes it clear that while marriage is God's design for most, a life of celibacy is a specific, divine enablement. He contrasts the disciples' self-serving logic ('it's not good for us') with God's sovereign gifting.
This 'gift' isn't about avoiding the 'bitterness' or 'annoyances' that can come with marriage (as the commentaries note). Instead, it's about being uniquely equipped by God to pursue the 'kingdom of heaven' with undivided devotion. Those to whom it is given are set apart, enabled by grace to live a life free from marital responsibilities, so they can be more readily devoted to God's work. This isn't a lesser state, but a different calling, empowered by God's provision.