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An allusion to the Last Hour, when the world as known to man will come to an end and the ultimate reality of the hereafter will begin.
I.e., what he has done and what he has omitted to do. An alternative rendering would be, "what he has placed forward and what he has placed behind", i.e., what he prized more and what less in his erstwhile, subjective valuation. Thus, at the moment of resurrection man will suddenly understand the true motivations and moral implications of whatever he did - or consciously refrained from doing - during his life in this world: and this applies to all the good deeds he did and the sins he refrained from, as well as to all the sins he committed and the good deeds he failed to do.
A rhetorical question implying that no human being is ever entirely immune against "that temptation to evil (fitnah) which does not befall only those among you who are bent on denying the truth" (see 8:25 and the corresponding note [25]). The answer is given in verse {9} below.
I.e., "endowed thee with all the qualities and abilities relevant to the exigencies of thy individual life and thy environment".
Lit., "made thee proportionate", i.e., a being subject to physical needs and emotional urges, and at the same time endowed with intellectual and spiritual perceptions: in other words, a being in whom there is no inherent conflict between the demands of "the spirit and the flesh", since both these aspects of the human condition are - as stressed in the next verse - God-willed and, therefore, morally justified.
In view of the fact that the whole of this passage is addressed to "man" or "men" in general, and not merely to deniers of the truth, I believe that the expression "you give the lie" does not, in this context, necessarily imply a conscious denial of God's ultimate judgment but, rather, a tendency inherent in most human beings to close one's mind - occasionally or permanently, as the ease may be - to the prospect of having to answer before God for one's doings: hence my rendering, "you are tempted to give the lie".
The classical commentators are of the opinion that we have here a reference to the guardian angels who record, allegorically, all of men's deeds. However. another explanation has been suggested by me in my rendering of {50:16-23} and elaborated in the corresponding notes [11-16]. In consonance with that interpretation, the "watchful force" (hafiz) set over every human being is his own conscience, which "records" all his motives and actions in his subconscious mind. Since it is the most precious element in man's psyche, it is described in verse {11} as "noble".
For my rendering of thumma at the beginning of this verse as "And once again", see surah {6} note [31]. The repetition of this rhetorical question is meant to indicate that man's intellect and imagination cannot possibly answer it, since what is described as the Day of Judgment will usher in a reality which as yet is wholly outside our human experience and, therefore, cannot be grasped conceptually: hence, only allegory - and our own emotional response to it - can give us an inkling of what that reality might be.