 He also had a long literary feud with Sadhu Sundar Singh, but nevertheless defended him in time.Lastly he placed a high value in the role of women in the church, even in favour of ordination of women.Despite of Heiler's liberalism, his high church theology was also widely known among other, usually very conservative Lutheran high church theologians outside of Germany, because of at that time generally a rare ecumenical attempt, Heiler's Roman Catholic background and because of his interest on Liturgical Movement.