The Bible is full of figurative language. The idea of marriage being a “fountain” (4726) is one of them. This should not bring to mind the structure spewing water in decorative ways in the middle of the park. This should make you think of an artesian well bubbling up with fresh purity.
Notice that the fountain is not doing the blessing. It is the object to be blessed. The Hebrew word translated here is different than the Greek word. The Greek means to speak well of. The Hebrew means to bow before. If you are married then that relationship is to be given preference in your life. It is something that should be acknowledged as a dominant force. This is why one of the earliest decrees in history involve marriage,
(Genesis 2:24 KJV) Therefore shall a man leave his father and his mother, and shall cleave unto his wife: and they shall be one flesh.So? The covenant of marriage is the dog not the tail. It should determine the choices you make in occupation and leisure. It should monitor your relationships with the rest of your family. It is to be blessed.