Constant rubbing of a rope will cut a stone.
More Swahili Proverbs:
One who always depends on his brother will die poor.Swahili
One fire brand after another keeps fire burning.
Swahili
The death of not a relative is a wedding.Compared to a death of a relative.
Swahili
Two bulls do not live in the same shade.
Swahili
Effort will not counter faith.
Swahili
The timid crow withdraws his wings from harm.
Swahili