John 17:17 (NKJV)
Have you ever heard of a tuning fork? It is definitely not something you eat with, but it is a tool used to keep things in tune. When a tuning fork is stuck, it resonates at a certain pitch, a specific tone is produced that can then be used to tune musical instruments. Over time, pianos, guitars, and other musical instruments will get out of tune and a tuning fork can be used to check and see if these things are in tune. By using a tuning fork, you can be sure to keep things in tune.
God's Word is like a tuning fork, it helps to keep us "in tune" with God and His plans and purposes. It is easy to get away from a biblical perspective in our life when we are constantly bombarded with ungodly input. You don't have to go looking for some bad things or even be involved with things that you know are wrong, the world is filled with things that are contrary to God and His Word. This is why it is so important for each and every believer to have a regular time of reading and studying God's Word.
Every day as we live and work, we are surrounded with things that will get us out of tune, so to speak, with God; we must do something to keep ourselves in line and in tune with God. In John 17:17, Jesus prayed for His disciples to be sanctified, to be set apart, by the Word. Through daily time in the Word of God and by spending time with God in prayer we can be sure that we are keeping ourselves in line with God's plans and purposes, God's Word is like a tuning fork that helps keep us in tune with God.