The Pure in Heart

I am reading a book called '' The Pure in Heart,'' by Thomas Watson. Actually I read it once last year but, it is a book you could read again and again. Anyways, I highly recommend it, the following is a section of the book.

B. The subject of purity

''The subject of purity is the heart-''pure in heart.'' Purity of heart does not exclude purity of life, no more than the pureness of the foutain excludes the pureness of the stream. But it is called purity of heart because the heart is the main thing in true religion, and there can be no purity of life without it. A Christian's great care should be to keep the heart pure, as one would especially preserve the spring from being poisned. In a duel, a man will chiefly guard and fence his heart; so a wise Christian should above all things keep his heart pure. Take heed that the love of sin does not get in there, lest it prove fatal.''
''Christians should, above all things, breathe after heart purity;''Holding the mystery of the faith in a pure conscience'' (1 Titus 3:9). Justification causes our happiness; sanctification evidences it.''
- Thomas Watson