William Law, A Serious Call to a Devout and Holy Life, Chapter I (“Concerning the nature and extent of Christian devotion”).

Now let any one but find out the reason why he is to be thus strictly pious in his prayers, and he will find the same as strong a reason to be as strictly pious in all the other parts of his life. For there is not the le…

Devotion is neither private nor public prayer; but prayers, whether private or public, are particular parts or instances of devotion. Devotion signifies a life given, or devoted, to God.