The Vadakalai school holds that a positive effort is necessary, on the part of the Jivatma to attain the Lord's grace. The Lord can be accused of partiality or unkindness, if He gives moksha to some and not to others. Further, the Lord cannot grant moksha to all people. So, the Vadakalai school says that the Lord's grace has to have some reason, like the efforts by the individual soul. The Tenkalai school says that the Lord's grace (kripa) is spontaneous. He grants moksha to those whom He likes. The Vadakalai philosophy is compared with the practice of the monkey (markata nyaya). In the case of a monkey, the child must cling or attach itself to the mother. Similarly, the Jivatma has to make some efforts to gain Lord's grace. The Tenkalai school is compared to the cat system. In the case of a cat, the mother cat holds the child cat, in its mouth and moves about (marjara nyaya). Similarly, Tenkalai school states that it is the Lord, who grants favours to those, whom He likes.