Esther 4

For if you remain completely silent at this time, relief and deliverance will arise for the Jews from another place, but you and your father’s house will perish. Yet who knows whether you have come to the kingdom for such a time as this? v.14

Read chapter 4
Esther has no idea of the edict that was made to annihilate all the Jews and is wondering why Mordecai is mourning.  When she hears why she says she can't do anything to stop it even though she's queen because the king could kill her for approaching him without being summoned (a legit excuse I'd say).  But then Mordecai sends this response in verse fourteen.  It's truth and it's a challenge.  Mordecai knew of the Lord's deliverance and the promise to keep a remanent alive for the Messiah to come.  He tells her if she keeps silent about this God will use someone else.  It's starting to reveal that it's not just coincidence that Esther was made queen but was put in this position to save her people.  Sometimes we don't know why or we end up in places or situations we do, but God knows and uses us as instruments in His plan.  You may think you're no queen or you're a nobody, that someone else will step up and do God's work, but that can turn into you perishing- it's not about how special you are it's about how special you are to God.  You are not where you are just to take up space, but are created for a purpose and a job with your name on it.  Keeping silent in issues of truth with other believers is not helpful, we are all one in Christ and has ripple effects to the whole body of believers.  Yes we have to discern when are times to speak up and when are times to keep silent, but let's not be silent when we know the Spirit is urging us to step up for regret and sorrow may follow later.  God chooses and uses nobodies. He infuses them with His grace and His power and He uses them in mighty ways. (Nancy Leigh DeMoss) 
When was a time you kept silent when you know you should have said something?  What was the outcome?  Do you see yourself brought to where you are right now "for such a time as this"?  How so or why not?