The considerations raised at the end of the last chapter We must recognise both the sexual and the individual aspects of development were somewhat in the nature of a digression. Such a digression was however inevitable, for the questions involved in the controversy between the psychological schools of Vienna and Zürich (whose leading exponents are Freud and Jung respectively) are of fundamental importance for our present inquiry. Our whole attitude towards the psychological problems presented by the family relationships must to a very considerable extent depend upon whether we believe, as the more extreme exponents of the Zürich school would sometimes seem to do, that the whole significance of these problems lies in the fact that they are intimately concerned with the development of the vital energies and independence of the individual, or whether (following the Vienna school) we feel bound to recognise also the existence of a number of highly important sexual aspects which, directly or indirectly, play a fundamental r?le in the psychology of the family.