The Prince will say: “We must be resolute in addressing acts of unspeakable cruelty against people for reasons of their religion, their race or their beliefs, wherever they occur in the world.
“We must stand alongside each in determined defence of the future we owe our children and our grandchildren.
“The challenges to that future are manifest – whether from this dreadful pandemic which threatens not just our public health but our prosperity and security; or from the existential threat to our planet, and our way of life, from climate change and catastrophic biodiversity loss.”
In a reference to the catastrophic effects of war, he will add: “Let us remember all victims of war, tyranny and persecution; those who laid down their lives for the freedoms we cherish, and those who struggle for these freedoms to this day.
“They inspire us to strive for a better tomorrow – let us make this our common cause.”
The Prince and the Duchess will also attend a wreath-laying ceremony at the Neue Wache Memorial in Berlin, where they will observe a moment’s silence.
The trip is the heir to the throne’s first post-Brexit visit to Europe and comes just weeks before the Brexit transition period ends on December 31.
While members of the Royal Family are bound by convention to avoid all matters party political, it is seen as an illustration of non-political friendship and “soft power”.
Although Germany has recently been added to the UK’s quarantine list, certain diplomatic groups are covered by travel exemptions.
The royals had a coronavirus test 48 hours before they flew, Clarence House confirmed.