Now the trumpet summons us again — not as a call to bear arms, though arms we need — not as a call to battle, though embattled we are — but a call to bear the burden of a long twilight struggle, year in and year out, rejoicing in hope, patient in tribulation — a struggle against the common enemies of man: tyranny, poverty, disease and war itself.
John F. Kennedy (1917-1963) US President (1961-63)
Inaugural address (20 Jan 1961)
(Source)
Portions of this are one of the seven quotations by JFK at his grave site in Arlington National Ceremony.