'Person' in the Bible

What does a person gain in all his toil with which he toils under the sun?

For although a person may toil with great wisdom and skill, he must leave his reward to someone who has not toiled for it. This also [is] vanity and a great calamity.

For what does a person receive for all his toil and in the longing of his heart with which he toils under the sun?

There is nothing better for a person than to eat and drink and {find delight} in his toil. For I also realized that this [is] from the hand of God!

For to the person who [is] good in his eyes, he gives wisdom, knowledge, and joy; but to the sinner he gives the task of gathering and heaping up only to give [it] to [him who is] pleasing to him. This also [is] vanity and chasing wind!

So I concluded that there is nothing better for a person than to enjoy [the fruit of] his labor, for this is his lot in life. {For no one knows what will happen in the future.}

Also if two lie together, {they can keep each other warm}. But how can one person be warm?

{Although an assailant may overpower one person, two may withstand him}. A threefold cord {is not easily broken}!

Better to go to the house of mourning than to go to the house of feasting, for [death is] the end of every person, and the living should take [it] to his heart.