In the most constricted sense, an idea is a fit of imagination or a concept formed in the mind with the aim to improve one’s situation or develop new concepts. However, most philosophers and socialist define an idea on a more broader scale. Without thoughts, mankind would have found it difficult to progress and introduce newer concepts. Ideas are generally comprised as innate, abstract and concrete ideas. An idea is usually judged based on its validity and the soundness of a thought and often depends on the extent of knowledge a person possesses. Go through these famous idea quotations & sayings to feel inspired to create pioneering viewpoints.