In Latter-day Saint temples, initiates are washed, anointed, and purified. Although, at that point, we do not stand in the presence of God, we are preparing to enter into a covenant with God, and because we are entering into a relationship with God, we must be pure in order to even be in that close proximity with the divine. So, this word pure in the statement, "That our hearts may be purified," in the middle of verse 2, similarly indicated the people’s willingness at that point. Their desire to do this showed that they were ready to do what would be coming next. They were prepared to enter into, or to renew, the covenant. They desired the benefits of the Atonement, becoming pure again and reunited with God in mind, body, and spirit. They knew that the Atonement had been prepared from the foundation of the world and also that salvation could only come through its sanctifying power. They were then filled with joy, having received a remission of their sins and peace of conscience. That feeling of having a clear conscience before God, knowing that you have done what you could and then continuing with faith in Jesus Christ, is the sweet blessing of the Holy Ghost accepting of our sacrifice and commitment to obey.