"Q&A" about love and marriage, as well as understanding: First, understand love. Love is beautiful, emotional, impulsive, giving, and fleeting—a high-stimulation feeling of happiness. And if it evolves into marriage, all of these will disappear, becoming more rational, relying on values, cooperation, shared growth, emotional complementarity, and persistence—an alliance to jointly resist external challenges. All cognitive improvements stem from the ability to clearly explain the world.