To pound water with a mortar is futile.
More Kikuyu Proverbs:
He who seeks his goat with the man who ate it, is certain not to find it.
Kikuyu
The only thing good, though old, is the 'muratina'.
Kikuyu
A piece of land is not a little thing.
Kikuyu
That of circumcision is a hard appointment.
Kikuyu
To be laughed at is not to be pitied.
Kikuyu