Here are some beautiful fourth-year sentences: A happy life requires hard work. True friendship is in the heart and not written on the face. Diligence is the mother of success. Honesty is the best policy. Courage is the key to solving problems. Everyone has their own unique talents. The important thing is to have love and compassion. Learning requires constant effort and perseverance. 9. Only by working hard can you get good results. Kindness brings good luck. These short sentences were rich in philosophy and could guide students to establish correct values and outlook on life.