From: Swahili, East Africa
Source: Swahili (East Africa) oral-tradition proverb (Asiyesikia la mkuu huona makuu), Swahili Proverbs project, Department of African Studies, University of Illinois (swahiliproverbs.afrst.illinois.edu) — elder advice entry
The source explains it: One who does not listen to the advice of an elder will see bad things
. The wording of the meaning is ours.