Isaac Watts 
Guide to Prayer, or a Free and Rational Account of the Gift, Grace, and Spirit of Prayer [PDF ebook] 
With Plain Directions How Every Christian May Attain Them

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. HE duty of prayer is so great and necessary a part of religion, that every degree of assistance toward)