Mhubiri 10 : 10 Ecclesiastes chapter 10 verse 10

Iwapo chuma hakipati, wala mtu hakinoi; Ndipo hana budi kutumia nguvu zaidi. Walakini yafaa kutumia hekima, na kufanikiwa.
soma Mlango wa 10

If the axe is blunt, and one doesn't sharpen the edge, then he must use more strength; but skill brings success.