Religious vows are of two varieties: simple vows and solemn vows. The highest level of commitment is exemplified by those who have taken their solemn, perpetual vows. There once were significant technical differences between them in canon law; but these differences were suppressed by the current Code of Canon Law in 1983, although the nominal distinction is maintained. Only a limited number of religious congregations may invite their members to solemn vows; most religious congregations are only authorized to take simple vows. Even in congregations with solemn vows, some members with perpetual vows may have taken them simply rather than solemnly.