Inside the human mind, an idea is a mental spark that occurs as a response to the challenge of a train of thought.

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

The development of human civilization over the course of millennia was really fascinating. Let us imagine, however, how high a level of development could have been reached if all amazing ideas of the great minds of the past had been realized. Let us consider, for example, some ideas of Nikola
Tesla that have not been implemented as of yet.

Some old and unrealized ideas will undoubtedly be actualized when their time comes.

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

True friendship doesn't include jealousy.