The strong bond of friendship is not always a balanced equation; friendship is not always about giving and taking in equal shares. Instead, friendship is grounded in a feeling that you know exactly who will be there for you when you need something, no matter what or when.

This quote is saying that true friendship is not about keeping an exact balance between what each person gives and takes. A strong bond of friendship is based on knowing that no matter what you need, your friend will be there for you. It isn’t about taking turns giving and expecting a certain amount in return. It’s about having someone you can count on when you need them.