Evangelization failure led Tempels to dialogue-based mission methods.

Evidence

Tempels observed that a number of missionaries had feelings of despair seeing that many baptized Africans were growing indifferent to Christianity, while others were just leaving the Church altogether. In light of this failure, he proposed his method of dialogue with the Africans on deep existential issues and listening to the wisdom of African traditional religions. — Frans Dokman, Beyond Bantu Philosophy_…, 707

Categorization

• corroborated: 2 independent passages support this claim — Frans Dokman, Beyond Bantu Philosophy_…, 707
• XREF: connects to: Even irenic interfaith dialogue served Christian apologetic strategy