COVID has definitely shown that nothing can be taken for granted and that everything changes.
As OVID (the Ancient Roman poet, born 43 BC) so wittily expressed in his poem “Metamorphoses”:
“As wave is driven by wave
And each, pursued, pursues the wave ahead,
So time flies on and follows, flies, and follows,
Always, for ever and new. What was before
Is left behind; what never was is now;
And every passing moMent is renewed.”