President Woodrow, on arrival in Paris in 1918, wanted a peace treaty based on justice, not bitterness and anger. He believed that justice would produce a lasting peace.
After the war had just ended, the other allies were filled with bitter anger. They demanded a treaty that would punish Germany severely . They wanted to make Germany weak by destroying its military and industry. They wanted to ruin Germany's economy by making it pay all the war damages. They said Germany must never go to war again.
Woodrow didn't fully agree with them. That is why he felt bitterness and anger must give chance to justice.