Matthew Henry describes grace as 'salt that seasons' our words and 'keeps them from corrupting'. Salt has two primary purposes: it preserves, and it adds flavour. So when the Bible says your words should be 'seasoned with salt' (Colossians 4:6 NIV), it means they should preserve and not corrupt, always be in good taste, and promote well being. James the apostle says,

'You can't draw fresh water from a salty spring.' (James 3:12 NLT) In other words you can't fake what's in your heart. It's not just a question of learning to say the right things; it's about having a right attitude, because what you say reflects 'the things that are in [your] heart.' (Matthew 12:34 NCV) Solomon says, 'There is one who speaks like the piercings of a sword, but the tongue of the wise promotes health.' (Proverbs 12:18 NKJV) Unless you are careful, you can end up talking yourself and the people around you into all kinds of problems. Mark Brazee says: 'We have the ability to speak words of faith, which cause miracles to manifest...Faith is a law and we operate in it with our words, either to our benefit or our destruction..."The tongue of the wise promotes health." We could turn that around and say, "The tongue of the unwise promotes sickness." It's your choice. You can line up your mouth and heart with what the devil tells you, or you can operate in faith by lining your mouth and heart up with God's Word, pointing towards His blessings. Faith works by believing and saying what God says.' So begin to speak words of healing.