Some great quotes, (all are by one of my favorite poets), Rumi:

Raise your words,
Not your voice.
It is rain that grows flowers,
Not thunder -Rumi

What hurts you,

Blesses you -Rumi

Maybe you are searching among the branches,

for what only appears in the roots -Rumi

Do not try to explain,

they will only understand you as much as they see and hear -Rumi

Yesterday I was clever,
so I wanted to change the world,
Today I am wise,
so I am only changing myself -Rumi