Teresa of Avila

"You need not go to  heaven to see God,
  nor need you speak loud as if God were far away,
  nor need you cry for wings like a dove to fly to him;
  only be in silence
  and you will come upon God within yourself."

St. Teresa of Avila, a mystic who lived in 16th century Spain, is one of the great teachers of prayer in the history of the church.