1. A believer in Kalimah Shahadah can never be narrow in outlook :

He believes in a God Who is the Creator of the heavens and the earth, the Master of the East and the West and Sustainer of the entire universe. After this belief he does not regard anything in the world as a stranger to himself. He looks on everything in the universe as belonging to the same Lord he himself belongs to. His sympathy, love and service are not confined to any particular sphere or group. 

        2.This belief produces in man the highest degree of self-respect and self esteem :

The believer knows that Allah alone is the Possessor of all power, and that none besides Him can benefit or harm a person, or provide for his needs, or give and take away life or wield authority or influence. This conviction makes him indifferent to, and independent and fearless of, all powers other than those of God. He never bows his head in homage to any of God's creatures, nor does he stretch out his hand before anyone else as those who associate other beings with God or deny God. 

       3. Along with self-respect this belief also generates in man a sense of modesty and humbleness :

It makes him unostentatious and unpretending. A believer never becomes proud, haughty or arrogant. The boisterous pride of power, wealth and worth can have no room in his heart, because he knows that whatever he possesses has been given to him by God, and that God can take away just as He can give.              

        4. This belief makes man virtuous and upright :

He has the conviction that there is no other means of success and salvation for him except purity of soul and righteousness of behavior. He has perfect faith in God Who is above all needed, is related to none and is absolutely just. This belief creates in him the consciousness that, unless he lives rightly and acts justly, he cannot succeed. No influence or underhand activity can save him from ruin. As against this, the kafirs and the mushriks always live on false hopes. Some of them believe that God's son has atoned for their sins; some think that they are God's favourites, and will not be punished; others believe that their saints will intercede with God on their behalf; while others make offerings to their deities and believe that by so bribing the deities they acquire a licence to do whatever they like.

          5. The believer never becomes despondent :

 He has a firm faith in God Who is Master of all the treasures of the earth and the heavens, Whose grace and bounty have no limit and Whose powers are infinite. This faith imparts to his heart extraordinary consolation, fills it with satisfaction and keeps it filled with hope. Although he may meet with rejection from all sides in this world, faith in and dependence on God never leave him, and on their strength he goes on struggling. Such profound confidence can result from no other belief than belief in one God. Mushriks, kafirs and atheists have small hearts; they depend on limited powers; therefore in times of trouble they are soon overwhelmed by despair and, frequently, they commit suicide.   

         6.This belief produces in man a very strong degree of determination, patient perseverance and trust in God :

When he makes up his mind and devotes his resources to fulfilling the Divine Commands in order to secure God's pleasure, he is sure that he has the support and backing of the Lord of the universe. This certainty makes him firm and strong like a mountain and no amount of difficulties, impediments and opposition can make him give up his resolution. Shirk; kufr and atheism have no such effect.   

           7. This declaration inspires bravery in man :

There are two things which make a man cowardly:

(i)    fear of death and love of safety, and

(ii)   he idea that there is someone else besides God, who can take away life and that man, by adopting certain devices, can ward off death. Belief in La ilaha illallah purges the mind of both these ideas. The first idea goes out of his mind because he knows that his life and his property and everything else really belong to God, and he becomes ready to sacrifice his all for His pleasure. He gets rid of the second idea because he knows that no weapon, no man or animal has the power of taking away his life; God alone has the power to do so.         

         8.The belief in La ilaha illallah creates an attitude of peace and contentment, purges the mind of jealousy, envy and greed and keeps away the temptations of resorting to base and unfair means for achieving success :

The believer understands that wealth is in God's hands, and He apportions it out as He likes. He knows that success and failure depend on God's grace; if He wills to give, no power in the world can prevent Him from so doing; and if He does not will it, no power can force Him to. On the other hand, the mushriks, the kafirs and the atheists consider success and failure as dependent on their own efforts and the help or opposition of earthly powers. Therefore, they always remain slaves to cupidity and envy.. Jealousy and envy of others success eat them away, and they will stop at nothing to bring about the downfall of a successful rival.    

           9.The most important effect of La ilaha illallah is that it makes man obey and observe God's Law :

One who has belief in it is sure that God knows everything hidden or open and is nearer to him than his own jugular vein. So, he will shun what God has forbidden and he will carry out His behests even in solitude and in darkness.