18 Then Jesus came to them. He said, "All authority in heaven and on earth has been given to me. 19 So you must go and make disciples of all nations. Baptize them in the name of the Father and of the Son and of the Holy Spirit. 20 Teach them to obey everything I have commanded you. And you can be sure that I am always with you, to the very end."
Acts 1:1-5,7-9(New Living Translation)
1 In my first book I told you, Theophilus, about everything Jesus began to do and teach 2 until the day he was taken up to heaven after giving his chosen apostles further instructions through the Holy Spirit. 3 During the forty days after his crucifixion, he appeared to the apostles from time to time, and he proved to them in many ways that he was actually alive. And he talked to them about the Kingdom of God.
4 Once when he was eating with them, he commanded them, “Do not leave Jerusalem until the Father sends you the gift he promised, as I told you before. 5 John baptized with water, but in just a few days you will be baptized with the Holy Spirit.”
7 He replied, “The Father alone has the authority to set those dates and times, and they are not for you to know. 8 But you will receive power when the Holy Spirit comes upon you. And you will be my witnesses, telling people about me everywhere—in Jerusalem, throughout Judea, in Samaria, and to the ends of the earth.”
9 After saying this, he was taken up into a cloud while they were watching, and they could no longer see him.
Now that we have been blessed by a gracious and merciful God, what should we be doing? How do we show our thankfulness for what has been done one our behalf? The answer is that it is our responsibility to tell others about salvation in Jesus Christ and Jesus Christ alone. This is not a suggestion, or an "if you have time", it is a command. Jesus said,"So you must go and make disciples of all nations". Go means to go and do it.
This is probably the hardest of any of God's commands to follow, because often it is hard to tell others about Christ. We get stuck with wondering what other people might think about us. But I say it is more important to please God. This is what Jesus had to say about it:
Matthew 10:32-34 (New King James Version)
32 “Therefore whoever confesses Me before men, him I will also confess before My Father who is in heaven. 33 But whoever denies Me before men, him I will also deny before My Father who is in heaven.
That is a serious statement, and it carries with it serious consequences. To be able to speak about your faith, be sure that you are rock solid in what you believe.