This proverb emphasizes the importance of expressing feelings, because if a person just hides his love in his heart without expressing it, he may miss many opportunities, such as expressing his feelings, getting the love of the other person and establishing a deeper relationship. Therefore, it is very important to express your feelings bravely at an appropriate time.
In addition to this proverb, there are some similar expressions, such as "love burns in the heart", "love is hard to say in the heart" and "love is hard to say in the heart", all of which describe the dilemma that this kind of love cannot express.