A true friend is a source of strength and hope.

—JonathanLockwoodHuie

One possible version：

This_quotation_from_Jonathan_Lockwood_Huie_tells_us_that_real friends can give us strength and hope when we are in trouble and real friends can benefit from each other.We need such friends that can point out our mistakes directly and who have the same life goals as us.Once I failed again and again in my math and lost interest in it，it was my best friend that encouraged me not to give up and offered help in time.With his kind and selfish help，I gradually caught up with others.

So I say we need friends but what we most need is a friend that can rich our life.