Fluttershy is my favorite pony. I'm not alone in that sentiment. Lots of bronies identify with Fluttershy, the gentle pegasus whose Element of Harmony is kindness. My Little Pony tattoos are common. But this one, I think, expresses the basic impulse beneath brony culture. Shakara Tattoo inked it on the arm of DeviantART member Captain Ambivalent. She attributes the line to singer and songwriter Morrissey.
Now permit me to play devil's advocate here: how does being gentle and kind require strength? I'm having trouble making the logical connection.