From today's Gospel (Matthew 23:1-12):
'Anyone who exalts himself will be humbled, and anyone who humbles himself will be exalted.’'
It's hard to be humble. It's in our human nature to seek recognition for the good things we do. It's hard to stay quiet after we do a good deed such as helping an old person with their shopping or feeding a homeless person.
The Pharisees wanted recognition for their great deeds. They wanted to shout about how great they were from the rooftops; "look at me, I am doing such good works!"
However, their great works have nothing to do with them just as ours have nothing to do with us. All our good works are the work of Christ. It is Jesus working in our hearts who helps the elderly and who feeds the poor. We are used by Jesus as an instrument of his love, mercy and compassion.
Our joy is not in doing good deeds; our joy is recognising that Jesus is truly present working through us for the good of the Kingdom of God.