"when everything seems to be going against you, remember that the airplane takes off against the wind, not with it." I really like this one. Its not really engineering but there is a little bit of physics there :3 also "engineers like to solve problems. If there are no problems, they will create their own." this makes me think twice before I design something. Is there a problem in the previous designs, if yes! then I ask myself, is this a real problem or I am making this up. If it is a real problem, then how can I make it better, if no! then there is nothing to make better.