It is not shame for a man to learn that which he knows not，whatever his age.
一个人不论年龄多大，都要学习自己不懂的东西。这不是羞耻。
Every artist dips his brush in his own soul, and paints his own nature into his pictures.
Cada livro é uma viagem para um mundo desconhecido, cheio de possibilidades.
解析：不要贪天之功，不要掩人之善。