'RShimon says: Be meticulous in reciting the Shema [and in prayer]. And when you pray, do not make your prayer fixed, rather [an entreaty for] mercy and a supplication before the Omnipresent, as it is said: For He (God) is gracious and compassionate, slow to anger, abounding in kindness, and relentful of punishment.” And do not view yourself as a wicked person.