Mature means "a mature, sensible, and spiritual adult."
Many of Nao Lingerie's customers are mature, refined, and calm, and I'm sure they are trustworthy and relied upon by many people, both at work and in their private lives. Those who are persistent and hardworking may often find themselves making sacrifices without even realizing it.
Doing things for others can be a great source of motivation, but when it gets too much, take some time for yourself. Enjoy your favorite chocolate, cocoa, or cafe au lait and take the time to acknowledge and praise yourself for your efforts.
And please remember that your altruistic spirit is noble and wonderful. You are already doing your best. May the warmth reach the hearts of those who work hard.