the process is diphasic, that is, that it occurs in two waves… The resultants of infantile object-choice are carried over into the later period. They either persist as such or are revived at the actual time of puberty.
Freud establishes the foundational structural claim that object-choice is diphasic, with infantile cathexes persisting as the ‘affectionate current’ that shapes all subsequent adult erotic life.
, Three Essays on the Theory of Sexuality, 1905thesis