Sensei no Hanashi: Words from Manaka Sensei

Manaka Sensei talked to us about a couple of things before training:

子曰、吾十有五而志乎学、三十而立、四十而不惑、五十而知天命、六十而耳順、七十而従心所欲不踰矩

“The Master says: At 15 I set my heart on learning, at 30 I know where I stood, at 40 I have no more doubts, at 50 I knew the will of Heaven (life’s purpose), at 60 my ears were attuned (i.e. my moral sense was developed), and at 70 I followed my heart’s desire without crossing the line.”

and

他人の褌で相撲を取る
Tanin no Fundoshi de Sumo wo Toru
Do not try to use someone else's Fundoshi ( Sumo wrestler underwear) to do Sumo.
Which means: to profit at someone else's expense; to rob Peter to pay Paul; to take risks with other people's money