Before revision: Psychological perspectives Freud 160px|Sigmund Freud Sigmund Freud, who is considered the originator of the modern use of the term, defined libido as "the energy, regarded as a quantitative magnitude... of those instincts which have to do with all that may be comprised under the word 'love'."S.
After revision: And for the libidoPsychological perspectives Freud 160px|Sigmund Freud Sigmund Freud, who is considered the originator of the modern use of the term, defined libido as "the energy, regarded as a quantitative magnitude... of those instincts which have to do with all that may be comprised under the word 'love'."S.