All thanks are due to Allah, and may Allah's peace and blessings be on the Last and Final Prophet, Muhammad, and on his progeny, Companions and all those who followed and obeyed him until the Day of Resurrection.
This blessed booklet titled, How to Achieve Happiness, explains the meaning of true happiness, which is the ultimate goal that all mankind searches for in the worldly life. There are conflicting views and opinions concerning the meaning of happiness and the ways and means to achieve it. There are those who think that happiness is achieved by collecting money and investing it. Others think that happiness is earned by having a healthy body or security and peace at home. There are those who think that happiness is acquired through collecting wealth from lawful resources and seeking beneficial knowledge, and those who believe that happiness is earned through true faith, righteous conduct and remaining firm on this path. There is no doubt that these traits are all incorporated in the general meaning of happiness, as long as they conform to the guidelines and regulations established by Islam.
There are two types of happiness: first, there is the temporary, limited, changing and finite worldly happiness. Second, there is happiness in the Hereafter, which is infinite and everlasting. Both of these types of happiness are connected to each other, as happiness in this life is only perfected by earning the complete and perfect happiness in the Hereafter, which is earned through Allah's Pleasure by the faithful believers who fear and obey Him.