Hekayat 7 from Chapter 4 of Golestan of Saadi Shirazi

I heard one of the sages say: No one has ever admitted to their own ignorance, except for the person who interrupts someone else speaking and begins their own speech before the other has finished.

Speech has a beginning and an end, O wise one,
Do not bring one word in the middle of another.

The person of wisdom, intellect, and insight,
Will not speak until they see a pause in silence.

یکی را از حکما شنیدم که می‌گفت: هرگز کسی به جهل خویش اقرار نکرده است، مگر آن کس که چون دیگری در سخن باشد، همچنان ناتمام گفته، سخن آغاز کند.

سخن را سر است اى خردمند و بُن

میاور سخن در میان سخن

خداوند تدبیر و فرهنگ و هوش

نگوید سخن تا نبیند خموش