In the late 1830s Heldring began to speak publicly about justification of Christianity through faith. He appreciated the philanthropy of enlightened Christian associations such as ''
Maatschappij tot Nut van 't Algemeen'' (the Society for General Public welfare), but saw excessive focus on good works as a denial of Christianity. On the other hand, he criticized orthodox believers who lacked any form of Christ-inspired social labor. He envisioned a form of orthodox Christianity that understood the requirement for social work. This led him to join and become a leader of the
Réveil movement. From 1845–54 the
Christelijke Vrienden (Christian Friends), inspired by what De Graaf has called an "orthodoxy of the heart", undertook an impressive program of social and church activities in which Heldring played a central role. Heldring had a well dug at the hamlet of
Hoenderloo in 1843 and established a school there in 1846, a home for neglected boys in 1851 and a church in 1858. In 1845–46 Heldring worked hard to relieve the desperate conditions created by the potato blight through publicizing the problem and raising donations. In the late 1840s he helped with the migration of poor families from
Betuwe to the newly reclaimed
Anna Paulownapolder. He also helped promote Protestant Christianity in the
Dutch East Indies, and was the driving force behind creation of the
Algemeen Christelijk Nationaal Zendingsfeest missionary society. Heldring was the first social activist in the Netherlands to advocate providing care to prostitutes rather than punishing or repressing them. He established the first asylum for "fallen" women in
Zetten, a village in his parish. The "Steenbeek" asylum opened in 1849 as a home for prostitutes who wanted to start a new life. Heldring was supported by the Amsterdam Réveil circle, which established the Association for the Encouragement of Penitent Fallen Women in 1846. The women and girls at the asylum stayed in an austere environment, were given basic education, read the Bible and sang. The board took responsibility for them after their release, trying to find them jobs as domestic servants with respectable families or in institutions. By 1870, 825 women and girls had passed through the asylum, which had inspired institutions on similar lines across the Netherlands and throughout Europe. Heldring also founded Talitha Kumi in 1857 for neglected girls aged twelve to sixteen, Bethel in 1863 for girls from sixteen to twenty, a Christian normal school in 1864 and the Vluchtheuvel Church in 1870. The church was built on an artificial hill and had an attic that could be used as a refuge during the floods that periodically ravaged Betuwe at that time. Heldring died on 11 July 1876 in
Marienbad aged 72.
Hendrik Pierson succeeded Heldring in Zetten. ==Publications==