In verse 20 he says:  I did not shrink from declaring to you anything that was profitable, and teaching you publicly and from house to house.
20Ma swi tiva leswaku a ndzi mi fihlelanga nchumu xa leswi swi fanelaka ku mi pfuna, ndzi ri karhi ndzi mi tivisa Rito ni ku mi dyondzisa erivaleni ni le mindyangwini ya n'wina.