English Standard Version (ESV)
So Haman (bad guy) is working to get all the Jews killed while the King stands idly by. Mordecai is mourning, and Esther seems caught in the middle. Mordecai sends Esther this short note, a tremendous call to action. Mordecai reminds Esther that even though she is close to the King, she is in danger as well, and then asks if perhaps she is here for such a time as this.
It's easy to forget about danger when we're comfortable. We can read about Christians being persecuted (Voice of the Martyrs is a great resource for this), but when we're safe in our homes, it's hard to internalize what that persecution is really like. It's hard to grasp what true hunger is like when our bellies are full, and it's hard to know economic scarcity when we have a rainy day fund in the bank account with enough to get us through a month if we need it. (This is part of the problem we have with recognizing how great of a debt we owe God -- when we're comfortable, it's easy to forget how lost we would be without Christ and how great the weight of sin would be without Christ!)
Mordecai reminds Esther of the threat, but also reminds her that perhaps she has been equipped for just this time. Perhaps you, too, have been called and equipped by God for such a time as this. Perhaps you have unique gifts to offer to the world or your community that might be a source of encouragement and hope. Perhaps for such a time as this you are to call others to serve the poor and hungry, to look out for widows and orphans, to remind those in power of their responsibility to the weak. Perhaps in such a time as this, you are the one who can be vulnerable to show that weakness is not weak. Perhaps in such a time as this, you have been set in just the place you are in to witness to the love and grace and mercy of God and invite others to worship God as Lord and Savior.