Sister Vajirā (Hannelore Wolf) was a dasa sil mata, a Buddhist ten precept-holder nun in Sri Lanka.

Hannelore was so impressed that she came to the seminary group of Debes, one of the most prominent lay Theravada teachers at that time, and took part in her first “weeks of investigation” in an Adult Education College in the Lüneburger Heide area.

However, she suffered internal lack and noticed that she could not possibly meditate all day long and became physically ill.

Ñānavīra Thera, who lived 40 km from her in a kuti in the jungle as a hermit, had sent her a text he had written, A Note on Paticca Samuppāda, wherein he criticized the extension-over-three-lives interpretation.

This search finally yielded its fruit when she, by her own account (as given in a letter to Ñānavīra Thera), attained sotāpatti, or Stream-entry in late January 1962.

The one who has "entered the stream" has ipso facto abandoned personality-view (sakkāya-ditthi), which is the self-view implicit in the experience of an ordinary worldling not free from ignorance, and understood the essential meaning of the Buddha's teaching on the Four Noble Truths.

But the rapidity and intensity of the change of her views caused a kind of nervous breakdown and she disrobed, returning to Germany on 22 February 1962.