S. Baring-gould 
Conscience and Sin — Daily Meditations for Lent [EPUB ebook] 

It is advisable that all should have a clear understanding as to the nature of Conscience, the dangers to which Conscience is liable, the Nature of Sin, and the Effects of Sin. Too many people go on easily from day to day making no spiritual advance, because they do not know what ails their Consciences, do not even suspect that their Consciences are ailing, and so make no effort to escape from their unsatisfactory condition. It is hoped that this little book of meditations may be of use to such.