Proverb meaning parents' advice (and even an eggplant flower) is so valuable that not one in a thousand is wasted — i.e., always heed your parents' counsel.
子どもが反抗しても、年を経ると『親の意見と茄子の花は千に一つも無駄はない』の意味が分かることが多い。
Even if children rebel, as they grow older they often understand the meaning of 'parents' advice is never wasted.'
祖父はいつも『親の意見と茄子の花は千に一つも無駄はない』と言って、私の進路を心配してくれた。
My grandfather always said 'parents' advice is never wasted' and worried about my future course.