What is the way to overcome feelings of frustration and self-dissatisfaction, and how can one get rid of jealousy towards a sister and the feeling of injustice due to differential treatment among children, knowing that the other children were subjected to harsh punishment from the parents?

Faith and trust in God are the foundation of success, so one must attach oneself to God and ask Him for success. Envy is a serious and reprehensible disease in Islamic law; Allah Almighty said: "Or do they envy people for what Allah has given them of His bounty?" and "And from the evil of an envier when he envies." Envy consumes good deeds and plants perpetual sorrow in the envier. Therefore, one must be patient and supplicate, for Allah is near and answers the call of the supplicant.