Signs are useful and necessary in our lives. For example, directional signs are there to guide us to where we intend to go. In our natural environment, the "signs of the times" tell us what to watch out for, so that we would be prepared should disaster strike. Non-verbal signs expressed by our spouse, our children, our siblings and our friends, tell us that something is wrong, or the person may be hurt, or the person may be unwell, especially when physical signs such as a rash or a boil appears. So as you can see, signs are useful.
However, in today's Gospel, the Pharisees came forward and argued with Jesus and asked for a sign from heaven to test Him. Even though there were already many signs making it quite clear who Jesus was, the Pharisees refused to acknowledge such signs. Instead, they wanted signs which jive with their way of thinking or understanding. But Jesus was not going to tolerate such arrogance and narrow way of thinking from the Pharisees, and all He did was, with a sigh that came straight from the heart, said, 'Why does this generation demand a sign? I tell you solemnly, no sign shall be given to this generation.'
Could some of us be like the Pharisees, even though many signs are already present around us? Are we still refusing to believe or accept such signs? God may have given many signs for us to repent, change our ways and return to His ways. But just like the Pharisees, our pride, arrogance, prejudice and ego, may have hindered and blinded us from accepting such signs. May we take heed of the signs around us, and make amends with the Lord, while we have chances to do so.