Hebrews 13:2:
Do not forget to show hospitality to strangers, for by so doing some people have shown hospitality to angels without knowing it.
(NIV)
Do not forget or neglect or refuse to extend hospitality to strangers [in the brotherhood--being friendly, cordial, and gracious, sharing the comforts of your home and doing your part generously], for through it some have entertained angels without knowing it. [Gen. 18:1-8; 19:1-3.](AMP)
Be not forgetful to entertain strangers: for thereby some have entertained angels unawares.
(KJV)

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A society that does not correctly interpret and appreciate its past cannot understand its present fortunes and adversities and can be caught unawares in a fast changing world.

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Luke 21:34:
'Be careful, or your hearts will be weighed down with dissipation, drunkenness and the anxieties of life, and that day will close on you suddenly like a trap.'
(NIV)
And take heed to yourselves, lest at any time your hearts be overcharged with surfeiting, and drunkenness, and cares of this life, and so that day come upon you unawares.
(KJV)

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Be not forgetful to entertain strangers, for thereby some have entertained angels unawares.

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Men achieve a certain greatness unawares, when working to another aim.

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