The main joy of Shabbat comes from the food we eat in purity and holiness at the three fixed meals and at other times during Shabbat. It is a mitzva to eat all kinds of fine foods and special delicacies. Those who truly experience the joy of Shabbat can by their very eating on Shabbat reach spiritual levels which they could only otherwise achieve by fasting. They can conquer anger and reach such levels of understanding that the radiance of God shines in their very faces. It is completely suffused with Godliness without the slightest hint of impurity.
Anger is conquered and the force of wild passion is uprooted and cast aside.
It is also necessary to give generously to charity. Then you will find a profound peace. That is the state of peace existing between people who are nevertheless unable to speak to each other. The radiance which Shabbat brings into the world stirs men to return to God out of love. When this happens, relief and healing are granted to the righteous in place of the trials and suffering they had to endure previously.