A young man asked Albert Einstein, the great German scientist, "What the secret of success  is.?" The scientist told him that the secret of success is hard work. A few days later the young man asked the same question again. Einstein was very _ . He did not say anything, but wrote a few words on a piece of paper. On it was written "A=X+Y+Z". "What does this mean?" asked the young man. "A means success," explained the old scientist, "X stands for hard work, Y for good method   and Z means stop talking and get down to work." In Einstein's opinion, the secret of success was   _  .
to work with great energy to work hard to learn from great scientists to raise   questions as many as you could