Actually the title was written in jest as self-esteem is one of the last things a Puritan would ever pray for. Actually quite the opposite. Read the prayer below that I found over at Journal from the Street. It stands in stark contrast to what is pushed in our culture today, sometimes even within the Church.
Lord Jesus, I sin –Grant that I may never cease grieving because of it, never think I can reach a point of perfection. Kill my envy, command my tongue, trample down self. Give me grace to be holy, kind, gentle, pure, peaceable, to live for thee and not for self, to copy thy words, acts, spirit, to be transformed into thy likeness, to be consecrated wholly to thee, to live entirely to thy glory.
Amen and amen