Romans 10:17 So then faith comes by hearing, and hearing by the word of God.

While this principal works spiritually, it works in other areas as well.  What we speak, we hear and internalize.  What we expose ourselves to is what we feed ourselves and what we grow on.  So, if we continue to hear positive, biblically based words, we grow our faith in God.  But, if we choose to hear negative or worldly words, we grow our faith in fear, selfishness and things not pleasing to God.  So, we make a conscious effort to improve our speech, make time to hear God’s Word, and declare God’s Word over situations.