John Gill Commentary Ecclesiastes 8:12

"Though a sinner do evil a hundred times, and prolong his [days], yet surely I know that it shall be well with them that fear God, that fear before him:" — Ecclesiastes 8:12 (ASV)

Though a sinner do evil an hundred times
That is ever so many times, a certain number for an uncertain; though he lives in a continued course of sin, being resolved upon the above consideration to give himself a swing to his lusts. The Targum renders it a hundred years; though be should live so long in sin, yet at last should be accursed (Isaiah 65:20) . This and what follows are said to check the boldness and presumption of the sinner upon the patience of God; and to make the people of God easy under the delay of justice, and the prosperity of the wicked; and his [days] be prolonged :
or rather, "and he prolongs unto him" ^F15 ; that is, God prolongs unto him, not days only, but the execution of the sentence against his evil works; or defers his wrath and punishment; so Jarchi,

``and the holy blessed God prolongs to him, and does not take vengeance on him;'' and to this purpose is the Targum, ``and from the Lord is given to him space to return;'' yet surely I know ;
from the word and promise, and from experience, having observed it in a multitude of instances, which have abundantly confirmed the truth; that it shall be well with them that fear God ;
not with a servile but filial fear, with a holy, humble, fiducial, affectionate, and an obediential fear; not through any terrible apprehension of his majesty, his judgment, his wrath now and hereafter; but under a sense of his being and perfections, and especially his mercy, grace, and goodness: it is well with such persons in all things; with respect to things temporal they shall not want what is proper for them; and with respect to things spiritual they are interested in the love, grace, and mercy of God; have much made known to them; are remembered by him; the sun of righteousness rises upon them; the eye of God is on them, and his heart towards them, and his hand communicates every needful supply to them; and they are guarded, not only by his angels, but by himself; and it is well with them at all times; in times of public calamity they are either taken from it beforehand, or preserved in it; all afflictions are for their good; it goes well with them at death and judgment; and they will be happy both in the millennium state and in the ultimate glory, So the Targum, ``it shall be well in the world to come with them that fear the Lord;'' see (Psalms 34:7–9) (31:15) (Revelation 11:18) ; with this compare (Isaiah 3:10Isaiah 3:11) ; it is added, which fear before him :
whose fear is not hypocritical, but sincere and hearty; not in show only, but in reality; not the precepts of men, and as before them, but as the sight of God; having always a sense of omniscience and omnipresence before them; and especially this fear is exercised by them when they are his house, in the assembly of his saints, attending his word and ordinances: or "which fear at his presence"; which fills them with a holy awe, as wall as with joy and gladness. The Targum is, ``which fear before him, and do his will.''

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FOOTNOTES:

1. 
   F15 (wl Kyram) "et prolongans ei", Montanus; "et prolongat in Deus dies", Pagninus; so Mercerus, Junius & Tremellius, supply it; "et prorogat dei Deus poenam", Piscator; "et differt Deus iram suam propter illium", Vatablus.