Fair-weather friends are unreliable companions who are only present in good times, while 'To have a friend, be a friend' highlights the reciprocity and qualities needed for true friendship.
Fair-weather friends are individuals who are only around when things are going well but disappear during tough times. It's important to shun their company because they lack true loyalty and reliability, making them unreliable in times of need.
To have a friend, be a friend means that in order to have a genuine friend, one must also exhibit the qualities of a good friend, such as kindness, support, and reliability.
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