I do not think reading the mystics would hurt you myself: you say you must avoid books which deal with 'feelings' - but the mystics don't deal with feelings but with love which is a very different thing. You have too many 'feelings,' but not nearly enough love.
Evelyn UnderhillMuch is now being said about evangelism; but before we get effective evangelism, we have to get effective evangelists. Evangelism is useless unless it is the work of one devoted to God, willing and glad to suffer all things for God, penetrated by the attractiveness of God. New machinery, adaptations and adjustments, are not the first need... but more devoted, adoring, sacrificial souls.
Evelyn Underhill