2. A true good friend is not a person who has endless topics to talk about together, but a person who will not feel embarrassed even if he doesn't talk
3. If a friend makes you angry. That shows that you still care about his friendship.
You can also write an inscription with famous sayings.
For example,
I am not poor if you have a genius. -(Qing) Zheng Banqiao
Know yourself in the sea, and heaven remains our neighbourhood. -(Tang) Wang Bo
we are both unhappy -- to the sky's end, we meet. We understand. What does acquaintance matter?. -(Tang) Bai Juyi
Mo Chou is ignorant of the road ahead, and everyone in the world knows you. -(Tang) Gao Shi
There is no such thing as a happy friend in the world, and there is no such thing as a quick friend. -(Qing) Pu Songling
Knowing each other is the most important thing, and knowing each other is the most important thing. -(Spring and Autumn Period) Mencius
A gentleman's friendship is as light as water, but a villain's friendship is as bitter as a cucumber. A gentleman is as light as a pro, and a villain is as willing as a doornail.
-(Warring States) Zhuangzi
It is near Zhu Zhechi, and those who are near Mexico are black. -(Western Jin Dynasty) Fu Xuan
Life is dear to each other, so why use gold and money? -(Tang) Li Bai
makes friends and keeps his word. -(Spring and Autumn) Midsummer
The friendship between cloth and clothes is unforgettable. -(Tang) li yanshou
A gentleman and a gentleman take the same road as friends, and a villain and a villain take the same interests as friends. -(Song) Ouyang Xiu
Life is about knowing each other. -(Song) Wang Anshi
Friends should be reconciled, but not married, and each looked back. -(Ming) Feng Menglong
A hero in adversity. -(Qing) Wei Xi
Two thousand gold is easy to get, but it is hard to find a bosom friend. -(Qing) Cao Xueqin
For my heart, for your heart, I will know each other and remember each other deeply. -(Song) Gu Xia