J. P. Guilford quotes:

The person who is capable of producing a large number of ideas per unit of time, other things being equal, has a greater chance of having significant ideas.

The ultimate solutions to problems are rational; the process of finding them is not.

To live is to have problems and to solve problems is to to grow intellectually.

Psychology should be the chief basic science upon which the practices of education depend. It should have supplied education with the information it needs concerning the processes of understanding, learning, and thinking, among other things. One of the difficulties has been that such theory as has been developed has been based primarily upon studies of behavior of rats and pigeons. As someone has said, some of the theory thus developed has been an insult even to the rat.