dedicated to hard work for the things one believes in 意味

• 《be ～》自らが信じることにひたすら打ち込む
  

• hard at work on one's homework:    《be ～》宿題｛しゅくだい｝に頑張って取り組む、せっせと宿題｛しゅくだい｝をする
• to work hard at one's lessons:    to work hard at one's lessons勉強に励むべんきょうにはげむ
• work as hard as one can:    一生懸命に働く、精いっぱい働く