The heart is huge and even the Bible says to guard it for out of the heart, spring the issues of life (Proverbs 4:23). Everything we do is with the heart. Our emotions, our actions, our words all done from the heart.
The hurts we experience, the triumphs, excitement for upcoming events all affect our heart and when the heart hurts, everything hurts.
To guard our heart means to protect it against decisions that would ultimately have a negative adverse affect on our lives.
I’m reminded of Philippians 4:8: “Finally, brethren, whatsoever things are true, whatsoever things are honest, whatsoever things are just, whatsoever things are pure, whatsoever things are lovely, whatsoever things are of good report; if there be any virtue, and if there be any praise, think on these things.” I believe The Lord had this verse written because He knew how hard it would be for us to live happy all the time.
To guard our hearts means to really trust and rely completely on Jesus for His guidance, intervention, encouragement, and correction.
It means totally and utterly surrender our will to Jesus in everything we do. The more we do that, the more we’ll see the hand of God active in our lives.
Even if we don’t understand what He’s doing and why, we will see and know in our hearts that God’s completely in control and knows what He’s doing. That indeed makes the heart happy.