Paradise is the abode of the righteous in the world of spirits (see 2 Nephi 9:13; Alma 60:13; Moroni 10:34), a “state of happiness,” a place hereafter where the spirits of the faithful “expand in wisdom, where they have respite from all their troubles, and where care and sorrow do not annoy” (Joseph F. Smith, Gospel Doctrine, p. 448). Those things which burdened the obedient- the worldly cares and struggles, the vicissitudes of life- are shed with the physical body.
Paradise is a place where the spirit is free to think and act with a renewed capacity and with the vigor and enthusiasm that characterized one in one’s prime. Though a person does not rest per se from the work associated with the spread of the gospel, at the same time he is delivered from those cares and worries so prevalent in a fallen world and a corrupt body.