When we find men occupied with any one thing more than another, we may be certain that that thing is the object of the heart. We are always characterized by what we seek, hence the importance of our words. If we are honest, our words are the expression of our minds. (I do not speak of dishonest people.) But when people are sincere—and we trust they seek with all their hearts thus to be—the words of the mouth disclose the state of the heart.
When we speak of ourselves [or of our interests in the world], it is evident what is before us. When we are filled with the Lord Jesus, the mouth bears testimony. It is the appreciation of Christ in His nearness to God, rather than in His immediate bearing upon us, that marks the difference between spirituality and the want of it.
W. Kelly