As we preach the Gospel to our friends and neighbors we must always stress grace, otherwise we can convert people to a Christianized form of moralism that implies it is possible for us to get right with God through our own works. The Gospel does demand a change of life, but this change of life is empowered by grace and occurs subsequent to conversion. If we are not stressing the priority of grace, we are no better than the first-century Pharisees.
For further study:
The Bible in a year: