Os cregin gwag fydd yn y sach, cregin gwag ddaw allan, bobol fach – nothing will come out of the sack except what is in it.

Os cregin gwag fydd yn y sach, cregin gwag ddaw allan, bobol fach.Dihareb Cymraeg. Ystyr Saesneg; English meaning: Nothing will come out of the sack except what is in it. Addaswyd o ddetholiad Diarhebion Cymraeg gan J. J. Evans 1965.