To every action there is always opposed an equal reaction； or， the mutual actions of two bodies upon each other are always equal， and directed to contrary parts.

The only thing necessary for the triumph of evil is for good men to do nothing.

O valor das coisas não está no tempo que elas duram, mas na intensidade com que acontecem. Por isso existem momentos inesquecíveis, coisas inexplicáveis e pessoas incomparáveis.

"You can't be a great leader without great people."

Don't let the noise of others' opinions drown out your own inner voice.

可持续性不是一种选择，而是唯一的前进道路。