Friendship is like money, easier made than kept.
友谊如金钱一般，容易得到却不易保持。
Without confidence there is no friendship.
没有信任，就没有友谊。
In prosperity our friends know us; in adversity we know our friends.
在顺境中，朋友结识了我们；在逆境中，我们了解了朋友。
A friend that you buy with presents will be bought from you.
用礼物“买来”的朋友终会被买走。