In this booklet the lectures given at the Monsignor W. Onclin Chair 2005 are published. R. Torfs' address is titled '(No) Separtion between Church and State', wheras that of M.P. Hilbert is called 'The Canons on Juridical Acts Applied to Marriage'. G. Robbers gave a lecture on 'Living Values. The Constitution for Europe and the Law on Religion'.