Ps-Clem Recogs 3.166:28 :ܕܗܕܐ ܕܝܢ ܣܟܠܘܬܐ ܐܡܗ݀ ܐܝܬܝܗ ܠܐ ܝܕܥܬܐ ܕܥܠ ܐܠܗܐ ܚܒܪܬܗ݀ ܕܝܢ ܘܚܬܗ݀ ܠܐ ܝܠܘܦܘܬܐ‏ : the mother of this folly is ignorance about God while its fellow and sister is unteachable-ness
See the entire entry for yālōp̄ū, yālōp̄ūṯā n.f. instructability