Among the necessary causes of happiness and cessation of grief and worry,is striving to remove the things that bring about grief,and acquire those that bring about happiness. This is achieved by forgetting the unpleasant things that have passed and he has no power to bring them back,and knowing that occupying his mind wit them is meaningless; in fact it is stupidity, bordering and lunacy. Therefore he has to struggle with his mind not to think of them. He should also struggle with his mind not to worry over the future, not to pay attention to illusions of poverty, fear or other unpleasant things he is imagining will descend on him in the future. He should know that nobody knows what will happen in the future,whether good or evil, or pleasure or pain; this is in the Hands of Allah alone. The slave has no control over it. His only due is to struggle to accomplish what will benefit him in the future, and ward off harm from him. He should also know that when the slave turns his mind away from worrying over the future in his affairs,and relies on his Lord for its betterment, and is satisfied that his Lord will do that for him, when he does all that, his heart will be tranquil, and his condition will be good, and his worries and anxieties will vanish.
Useful Ways Of Leading A Happy Life : Shaykh Abdur-Rahman bin Nasir As-Sa’di
…May Allah give us a better understanding & guide us to accept the truth