a man can do no more than he can.力所能及

nothing is to difficult

Do one thing at a time, and do well.
一次只做一件事，做到最好！

Never forget to say "thanks" .
永远不要忘了说“谢谢”！

Keep on going never give up.
勇往直前， 决不放弃！

Whatever is worth doing is worth doing well.
任何值得做的事就值得把它做好！

Believe in yourself.
相信你自己！

I can because i think i can.
我行，因为我相信我行！

Keep good men company and you shall be of the number.
近朱者赤，近墨者黑。

Don't aim for success if you want it; just do what you love and believe in, and it will come naturally.
如果你想要成功，不要去追求成功；尽管做你自己热爱的事情并且相信它，成功自然到来。

Kill two birds with one stone.
一箭双雕。

Learn and live.
活着，为了学习。

Let bygones be bygones.
过去的就让它过去吧。