Having an open mind is the most important precondition for creating new ideas.

The precondition for solving a problem is having a clear idea on how to solve it.

An idea occurs in the mind, where it is confined and useless. An idea lives when it leaves the mind.

Ideas represent a wonderful manifestation of the functioning of the human mind.

Intellectual capacity is a precondition for becoming a man of knowledge.

An unsolved problem bothers one's mind, just as a small stone in the shoe, until an idea for solving the problem comes to mind.