By using "of" Jefferson implies that there is a quantity of luck available, of which he will receive more if he works hard. It is possible to write the sentence without using "of" but it implies something slightly different, that luck is a quality that he receives. Both effectively mean the same, but have slightly different overtones.

Correction: Freedom *of Speech

Of is simply a preposition. It means belonging to, relating to, or connected with “I” Tomas Jefferson is connected with “it” It is his luck Also, Thomas Jefferson is considered the author of our republic. He loved God and believed in protecting human rights that come from God and not from government. Rights such as Freedom or Speech, Freedom of religion, Freedom to protest, and the right to defend oneself. Thomas Jefferson’s intellect and penmanship is the reason why America has survived as the oldest republic on Earth. Check out my teacher profile and let’s meet and make a learning plan.