“How little is all we can do for so generous a God, Who died for us, Who created us, Who gives us being, that we should not think ourselves happy to be able to acquit ourselves of part of the debt we owe Him for having served us, without asking Him for fresh mercies and favours? I am loath to use this expression, yet so it is, for He did nothing else during the whole time He lived in this world but serve us.”
Teresa of Avila (1515-1582), Interior Castle, translated by the Benedictines of Stanbrook: Christian Classics Ethereal Library, excerpt from the Third mansion, chapter 1, section 14.