Senator John McCain, speaking at the 2017 Munich Security Conference:
Make no mistake, my friends: These are dangerous times, but you should not count America out, and we should not count each other out. We must be prudent, but we cannot wring our hands and wallow in self-doubt. We must appreciate the limits of our power, but we cannot allow ourselves to question the rightness and goodness of the West. We must understand and learn from our mistakes, but we cannot be paralyzed by fear. We cannot give up on ourselves and on each other. That is the definition of decadence. And that is how world orders really do decline and fall.
This is exactly what our adversaries want. This is their goal. They have no meaningful allies, so they seek to sow dissent among us and divide us from each other. They know that their power and influence are inferior to ours, so they seek to subvert us, and erode our resolve to resist, and terrorize us into passivity. They know they have little to offer the world beyond selfishness and fear, so they seek to undermine our confidence in ourselves and our belief in our own values.
We must take our own side in this fight. We must be vigilant. We must persevere. And through it all, we must never, never cease to believe in the moral superiority of our own values—that we stand for truth against falsehood, freedom against tyranny, right against injustice, hope against despair … and that even though we will inevitably take losses and suffer setbacks, through it all, so long as people of goodwill and courage refuse to lose faith in the West, it will endure.
The speech is worth reading in its entirety.