When a Jew observes the sabbath he becomes like a partner in creation. How do you become a partner in something that was already done? How are Non-Jews connected to the Sabbath?
Prayer is the opportunity for a person to engage in an intimate relationship with G-d
Teshuva – the concept of repentance – is most probably the greatest gift that was given to mankind. Watch here to clarify the meaning of sin and repentance.