Why is telling people the gospel so important?
Can't you just live a happy wealthy life and tell everyone around you that God is blessing you? Isn't that good enough? Why does it matter if we tell anyone about the person, works, life, death, and resurrection of Jesus?
"For I am not ashamed of the gospel, because it is God’s power for salvation to everyone who believes, first to the Jew, and also to the Greek." - Romans 1:16
Here we see that THE GOSPEL IS GOD'S POWER, FOR SALVATION. That is massive! The Gospel message is the power of God used to bring about eternal salvation. The two most important things in all reality: God's power; and eternal salvation. And IT, The Gospel, is that!
"But we must always thank God for you, brothers loved by the Lord, because from the beginning God has chosen you for salvation through sanctification by the Spirit and through belief in the truth. 14 He called you to this through our gospel, so that you might obtain the glory of our Lord Jesus Christ." 2 Thessalonians 2:13-14
The Gospel is so important that it is God who we should be thanking!
It is so important that it is that which GOD does himself FOR YOU. He hand picks those for eternal salvation. Being personally chosen by the infinite eternal all-powerful Creator of all reality is huge. The way in which he does it is through the "calling" of The Gospel. God chooses when and where you hear THE truth, his truth, The Gospel; and believe.
What is more important in life, money? being physically fit? Having a strict diet? A secure good paying job with benefits? What good is all that if the value of money can be lost. Your health can change in an instant. Your diet becomes unmanageable and too expensive. Your employer lays you off. What then? The salvation bestowed to us through faith in The Gospel is something that can NEVER be taken away. It is something that can NEVER lose its value. It is, in value and size, eternal. The Gospel is ETERNALLY valuable and in worth. The Gospel doesn't get old, unhealthy, crippled, or pass away due to age; it lasts for ETERNITY.
Helping someone eat right, get in shape, and land a good paying job is nice and all, but NONE of those are ETERNALLY valuable in and of themselves. Being used by God, and serving Him to help someone understand and believe in The Gospel, now THAT is worth more than all things we can do for someone else. THAT is REAL love.
Consider what John the Apostle wrote:
"Jesus said, “Because you have seen Me, you have believed. Those who believe without seeing are blessed.” 30 Jesus performed many other signs in the presence of His disciples that are not written in this book. 31 But these are written so that you may believe Jesus is the Messiah, the Son of God, and by believing you may have life in His name." John 20:29-31
The Gospel was more important that writing down everything Jesus did on earth. The WHY Jesus did what he did was more important that every single detail of what he did. The WHY he healed and went to the cross and not all the facts and events of every single healing. The Gospel is ENOUGH so that you "may believe" that Jesus is THE Savior and THE Son of God. That you may BELIEVE in the person and work of Christ. And "by believing you may HAVE life [eternal]"
Why would you NOT want to give that to those who you love? Do you really love your family if you don't share with them the most important message in all eternity? Do you teach your children the gospel? Do you study it with your spouse? DO YOU understand and believe the ETERNAL VALUE and IMPORTANCE of The Gospel?