Intelligence is complex and multi-faceted, and it cannot be summed up in a single concept. The type of intelligence that is the easiest to investigate is logical-mathematical intelligence, but the intelligence of a human being is much more than that, and it would be silly to limit ourselves to that alone. Thanks to the advent of modern psychology, the concept of intelligence has also been extended to the subjective and personal skills that are part of the emotional sphere. A person may not be very capable of scoring well in classical intelligence tasks, those based on tests of logic, but may in any case possess rare psychological capabilities such as the ability to easily recognise their own and others' emotions, achieving a deep understanding of the motivations behind human behaviour and cause and effect relationships between the intra-psychic and interpersonal world. So-called emotional intelligence, unlike logic and mathematics, never stops increasing. It can be nurtured and enhanced throughout life, leading to a gradually increasing awareness of ourselves and the world around us. A person who is emotionally evolved, in other words intelligent, is one that can grasp the most profound messages sent by others, messages that sometimes even the senders are not aware they are sending.