User needs are both the starting point and the ultimate goal of product development.
对于有信仰的人,不需要解释。对于没有信仰的人,解释是不可能的。
"The only limit to our realization of tomorrow will be our doubts of today."
You have to believe in yourself when no one else does.
You must not think that what is hard for you to master is humanly impossible; and if it is humanly possible, consider it to be within your reach.