In my opinion, emotionally and mentally, marriage is a union between two people who like and embrace each other with all their attributes.
Signing a marriage certificate/ legal document is a contract, a proof of marriage.
then indeed they are both important as we also need a Paper letter to prove us being married and this will keep us reminding about being married , and yeah this is a union that will keep us tagging together all our life .
if given a chance and money ? I will marry my wife over and over again.