Proverbs 16:23 (NKJV)
If you were interested in getting physically fit you might hire a personal trainer to design a set of exercises to help you reach your goal. That person could also monitor your progress and help you make any necessary corrections. If you needed to learn how to drive you would find a qualified driving instructor to give you lessons on how to drive a car and they could ride along with you during the learning process to help you. If you wanted to learn another language you could go to a school or even hire a private teacher to help you with the language and give you advice on how to speak the language.
One area that everyone can use help with is with the words we speak. Our words are very important, which is why we see over and over again in the Bible an emphasis on being sure we speak the right words. How do we know the right words to speak? The first way is by seeing what God Himself has said about us and our life in His Word, the Bible. Secondly, the Holy Spirit will help to guide us into speaking the right words. However, even though the Bible shows us what to say and the Holy Spirit will direct us about what to say it is still up to us to say the right thing, we must choose the right words.
Proverbs 16:23 gives us the answer to how this will work in our life. From our heart, our inner man, our spirit, we must teach and train our mouth about the right things to say. We should never allow our mouth to just express whatever might come to our mind or repeat anything we hear. We must keep a constant vigil over our words to be sure that what we speak is in line with God's Word. We must fill ourselves with God's Words and choose the right words to speak in every situation; God will help us, but from our heart we must direct our mouth about what to say.