The Advantage of a Minyan

As told by
Eliezer Zalmanov
re: following verse (Gen. 28:16)

וייקץ יעקוב משנתו ויאמר אכן יש ה' במקום הזה
 ואנוכי לא ידעתי

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After Yakov had laid down to sleep at Har Hamoriah, the verse reads:
"וייקץ יעקוב משנתו ויאמר"
- the last letters of which spell
"צבור"

So we can understand the verse to mean this:
"That if a person prays in a minyan (צבור), then he can be certain that - as the verse continues:
"יש ה׳ במקום הזה"
and his prayers are accepted.

However, should he pray by himself - as the verse continues:
"ואנכי"

then the acceptance of his prayers are now more in doubt - as the verse continues:
"לא ידעתי"