'Alone' in the Bible

There is one that is alone, and he hath not a second; yea, he hath neither son nor brother; yet is there no end of all his labor, neither are his eyes satisfied with riches. For whom then,'saith he , do I labor, and deprive my soul of good? This also is vanity, yea, it is a sore travail.

For if they fall, the one will lift up his fellow; but woe to him that is alone when he falleth, and hath not another to lift him up.

Again, if two lie together, then they have warmth; but how can one be warm alone ?

And if a man prevail against him that is alone, two shall withstand him; and a threefold cord is not quickly broken.