What is the practical significance of sincere love?

In The Book of Songs, such as "Hold your hand and grow old with your son", it covers the sincere love view of true men and women, which is unpretentious, but it is better than vows of eternal love. The ancients still did. On the other hand, people nowadays are greedy for good colors. Once the fever subsides, there will be a series of problems such as flash marriage, trial marriage, puppy love and premature birth. If we can calm down and taste the wisdom accumulated by the ancients for thousands of years, then a series of emotional problems about men and women brought about by the rapid development of material civilization beyond spiritual civilization will be solved. The concept of love in The Book of Songs can make us return to reality and the truth, goodness and beauty of human nature.