“In science if you know what you are doing you should not be doing it.
In engineering if you do not know what you are doing you should not be doing it.”

“I don't encourage anybody to do what I do, you know? Why should you? More for me!”

Keith Richards (1943) British rock musician, member of The Rolling Stones

“I don't know exactly what you guys want to do, but let me tell you why you should do it with fruit flies.”

Eric F. Wieschaus (1947) American geneticist

“You should never let your fears prevent you from doing what you know is right.”

Aung San Suu Kyi (1945) State Counsellor of Myanmar and Leader of the National League for Democracy

“Do you love me?
What?
Do you?
I love you. I don't know if I trust you.
Maybe you shouldn't do either.
Maybe I'm the one who should decide!”

Joss Whedon (1964) American director, writer, and producer for television and film

“If you want to be successful, it's just this simple. Know what you are doing. Love what you are doing. And believe in what you are doing.”

Will Rogers (1879–1935) American humorist and entertainer

“Self-discipline is the ability to make yourself do what you should do, when you should do it, whether you feel like it or not.”

Elbert Hubbard (1856–1915) American writer, publisher, artist, and philosopher fue el escritor del jarron azul

“This is what you should know about losing someone you love. They do not travel alone. You go with them.”

Augusten Burroughs (1965) American writer

“Everything passes
Everything changes
Just do what you think you should do
And someday maybe
Who knows, baby
I'll come and be cryin' to you”

Bob Dylan (1941) American singer-songwriter, musician, author, and artist

“Love what you do and do what you love. Don't listen to anyone else who tells you not to do it. You do what you want, what you love. Imagination should be the center of your life.”

Ray Bradbury (1920–2012) American writer