Who said "The authentic I arises only in relationship to the Thou."?

This quote is attributed to Buber, Martin.

The authentic I arises only in relationship to the Thou. - Buber, Martin

"The authentic I arises only in relationship to the Thou."

Buber, Martin

Philosopher-Theologian Austrian-Jewish 1878–1965

"All real living is meeting."

"The I-Thou relationship is the primary word."

"When two people relate to each other authentically and humanly, God is the electricity that surges between them."

"The world is not comprehensible, but it is embraceable: through embracing, taking into our arms."