(Proverbs 5:18 KJV) Let thy fountain be blessed: and rejoice with the wife of thy youth.
We are to “rejoice” (8055) in the wife of our “youth” (5271). I think it is safe to take the principle and make it work both ways, so this is for both husbands and wives. For the single, well, you can file it away for future use.
In looking into “rejoicing” I find that this is a primary root. Grammatically that means that it is a foundational word. Other words are built on it but it doesn’t get any more basic. An attitude of rejoicing is basic for any marriage. Yes, I know. It is sometimes hard. I have been married for 38 years. I have been through the ups and downs. I have felt the pain and joy. I am not talking as a naive babe in the woods.
So rejoice and be glad in the woman, or man, that God has given you. If you are not married then make one of the foundations of your future covenant the kind of person that you will be thankful for twenty years from now.