Gądecki also noted that Pope Francis had expressed support for pro-lifers in Poland following mass demonstrations against the Constitutional Tribunal's ruling.
Protesters disrupted Masses while holding signs supporting abortion, left graffiti on Church property, vandalized statues of St. John Paul II, and chanted slogans at clergy.
The archbishop thanked those who witnessed to the value of human life despite being "often met with aggression and contempt."
He also praised communities in Poland that sought to defend unborn life.
"They are the voice of natural reason, which consistently, contrary to ideological conformism and opportunism, defends human life in every phase of its development," he said.
"They are the voice of hundreds of millions of people around the world who have discovered the beauty of every life."
"Unfortunately, this brave and righteous voice is often met with aggression and violence by the supporters of the civilization of death."
The archbishop praised people who not only worked for full legal protection of unborn life, but also offered help and support to expectant mothers.
"From the heart I bless all people of goodwill and pray for the grace of conversion for those who have not yet discovered the stunning beauty of every life," he wrote.
"I also recommend to God all those who in Europe maintain an awareness of their spiritual and religious and moral heritage."