John Fitzgerald "Jack" Kennedy (1917 – 1963), commonly referred to by his initials JFK, he served as the 35th President of the United States from January 1961 until his assassination in 1963.

865. There are risks and costs to action. But they are far less than the long-range risks of comfortable inaction.

866. The greater our knowledge increases the more our ignorance unfolds.

867. The goal of education is the advancement of knowledge and the dissemination of truth.

868. When power leads man toward arrogance, poetry reminds him of his limitations. When power narrows the area of man’s concern, poetry reminds him of the richness and diversity of existence. When power corrupts, poetry cleanses.

869. If a free society cannot help the many who are poor, it cannot save the few who are rich.

870. Peace is a daily, a weekly, a monthly process, gradually changing opinions, slowly eroding old barriers, quietly building new structures.

510. A man may die, nations may rise and fall, but an idea lives on.

511. Mothers all want their sons to grow up to be president, but they don't want them to become politicians in the process.

512. Let every nation know, whether it wishes us well or ill, that we shall pay any price, bear any burden, meet any hardship, support any friend, oppose any foe to assure the survival and the success of liberty.

513. “Those who make peaceful revolution impossible will make violent revolution inevitable.

514. Efforts and courage are not enough without purpose and direction.

515. “World peace, like community peace, does not require that each man love his neighbor — it requires only that they live together with mutual tolerance, submitting their disputes to a just and peaceful settlement.

100. Change is the law of life. And those who look only to the past or present are certain to miss the future.

101. The cost of freedom is always high, but Americans have always paid it. And one path we shall never choose, and that is the path of surrender, or submission.

102. Ask not what your country can do for you, ask what you can do for your country.

103. If we cannot now end our differences, at least we can help make the world safe for diversity.

104. Efforts and courage are not enough without purpose and direction.

105. Conformity is the jailer of freedom and the enemy of growth.

106. Forgive your enemies, but never forget their names.

107. Let us never negotiate out of fear but let us never fear to negotiate.