Có công mài sắt có ngày nên kim
Ghi chú: Cố gắng thì việc khó thế nào cũng phải xong;
Tiếng Anh: With time and patience the leaf of the mulberry becomes satin. OR: a mouse in time may bite in two a cable, OR: diligence is the mother of success. OR: A willful man must have his way. OR: Where there's a will there's a way; OR: diligence is the mother of success; Or: Practice makes perfect