Srimad Bhagavatam Canto 07, Chapter 13, Text 10

SB 7.13.10

avyakta-lingo vyaktartho
 manisy unmatta-balavat
kavir mukavad atmanam
 sa drstya darsayen nrnam
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
Although a saintly person may not expose himself to the vision of human society, by his behavior his purpose is disclosed. To human society he should present himself like a restless child, and although he is the greatest thoughtful orator, he should present himself like a dumb man.
 
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
A great personality very much advanced in Krsna consciousness may not expose himself by the signs of a sannyasi. To cover himself, he may live like a restless child or a dumb person, although he is the greatest orator or poet.
Srimad Bhagavatam Canto 07, Chapter 13, Text 09
Srimad Bhagavatam Canto 07, Chapter 13, Text 11