Blessed are the pure in heart, for they will see God. But what does it mean to be pure in heart? Purity tends not to be a particularly popular concept these days. Maybe that is why, as Steven Croft puts it in Jesus' People: What the Church should do next, "The Church in our day has rather lost confidence in talking about holiness and purity of heart and life."
However, we do need to stand up for good things, for a life that is not contaminated. Croft again - "The Church is called to be a community where lives are changed and where people learn to live well."
With God's help, may we indeed point to good things, things that connect to God's holiness, and so be channels of God's transformative influencing for good.