I mean, in a passive sense of the word, to witness means that we saw something or heard something. In an active sense, we share our experience with somebody who wasn't there.
ok, "witnessing for God's Kingdom" means that we somehow KNOW something about it that needs to be shared with others. We SAW something and now we are testifying about it; but I don't seem to be able to recall what it was that I saw. I wasn't around to see how WW1 in 1914 was so meaningful (wrong generation, I guess.) Am I privy to some special insight about these last days? Not really, most people already know that the human race is in trouble, what with global warfare and weapons of mass destruction in the hands of scared-sh*tless, hate-filled warmongers.
But, really, what has there been for us to SEE with our own two eyes that is worth the trouble of telling people about? If I really could see that God is gathering His people into a safe haven of Christ-like (or even especially good) people I would consider it a privelege to invite strangers into the "ark." There just isn't enough to go on.
Have I missed something in the last 90 years that is socially, spiritually or in any way significant? Spare me the tricky mathematical/scriptural interpretations. What is God up to these days?