Good things come in small packages
You cannot accurately comment on the value of something by considering its size.
نمی توان از روی اندازه یک چیز درمورد ارزش آن نظر قطعی داد.
فلفل نبین چه ریزه بشکن ببین چه تیزه.
Don't underestimate her just because she is undersized, . Remember, good things come in small packages. She is a wonderful friend.