It's actually very difficult to make something both simple and good.

It is not easy to conceive the difficulties we have had.

innovation is a very difficult thing in the real world

It is hard to do, but the best things in the world do not come easily.

In fact, it is as difficult to appropriate the thoughts of others as it is to invent.

But in the end, for something this complicated, it's really hard to design products by focus groups. A lot of times, people don't know what they want until you show it to them.

It's not easy to do some of the work without going open.

The difficulty lies not so much in developing new ideas as in escaping from old ones.

It is difficult to struggle with the common law.

It is hard to change long-established building habits; such habits sometimes endure for ages in certain localities with little or no change. It is, however, easy for new communities to acquire bad building habits.

It's really hard to design products by focus groups. A lot of times, people don't know what they want until you show it to them.

The difficulty lies not so much in developing new ideas as in escaping the old ones.

It is very difficult to evolve by altering the deep fabric of life; any change there is likely to be lethal. But fundamental change can be accomplished by the addition of new systems on top of old ones.

Such concepts are simple, but not easy,