Remarks of the President (An excerpt):

I report to you that our country is challenged, at home and abroad:

--that it is our will that is being tried, not our strength; our sense of purpose, not our ability to achieve a better America;
--that we have the strength to meet our every challenge; the physical strength to hold the course of decency and compassion at home; and the moral strength to support the cause of peace in the world.

And I report to you that I believe, with abiding conviction, that this people--nurtured by their deep faith, tutored by their hard lessons, moved by their high aspirations--have the will to meet the trials that these times impose.

Since I reported to you last...

--... elections have been held... in the midst of war and under the constant threat of violence.
--A President... {has} been chosen by popular, contested ballot.
--The enemy has been defeated in battle after battle.
--The number of {people} living in areas under Government protection tonight has grown by more than a million since January of last year.

These are all marks of progress. Yet:

--The enemy continues to pour men and material across frontiers and into battle,despite his continuous heavy losses.
--He continues to hope that America's will to persevere can be broken. Well--he is wrong. America will persevere. Our patience and our perseverance will match our power. Aggression will never prevail.

But our goal is peace--and peace at the earliest possible moment.

President Lyndon Johnson, Annual Message to the Congress on the State of the Union, 17 January 1968

http://www.lbjlib.utexas.edu/johnson/archives.hom/speeches.hom/680117.asp