Jesus said:" Come unto Me all you that labor and are heavy laden, and I will rest you."  This is no mere invitation, it is a command stated in the imperative.  Jesus never said:' ...I will give you rest."  He said:"... I will rest you."  The rest that Jesus provides is both ontologic and existential.  His rest brings to an end the terrible and chronic tramua of sin.  Sin is real, and has real consequences.  Jesus is the only one who can rest us out from the power of sin.