SWEET IS HIS SPEECH WHO CONTROLS HIS TONGUE
Yo mukha Sannato bhikkhu manta1bhani anuddhato
Attham dhamman ca dipeti madhuram tassa bhasitam.
The bhikkhu who is controlled in tongue, who speaks wisely with his mind composed,
who explains the meaning and the text, - sweet indeed. is his speech. 
Bhikkhu Kokalika had abused the two Chief Disciples, Venerable Sariputta and Venerable Moggallana. For this evil deed Kokalika had to suffer. Learning about his fate, the bhikkhus remarked that Kokalika had to suffer grievously because he did not control his tongue. To those bhikkhus, the Buddha said, 'A bhikkhu must have control over his tongue, his conduct must be good, his mind must be calm, subdued and not flitting about as it pleases.'
- Mantahere means wisdom.