The fundamental mission of Christians is to proclaim the Good News.
The Good News is about the saving love of God for the world and we as Christians are to be witnesses of that saving love of God.
We are to be living signs that point to God’s saving love.
In the gospel, when the scribes and Pharisees asked Jesus for a sign, He pointed to Himself as the sign.
From how He lived and what He said, they should see the sign and what He was pointing at.
When others look at how we live and what we say, would they see us as signs pointing to God’s love?
We have to admit that there are times when we failed and became tarnished signs.
As we try to live up to our Christian mission, let us heed what the Lord is asking of us in the 1st reading, and it is this:
To act justly, to love tenderly and to walk humbly with our God.
That would be enough as a sign for others.