the world. Hebrew. 'olam = the ages; or the world (in relation to time). Here, put by Figure of speech Metonymy (of Subject) for that which is inscrutable by man, viz. obscurity as to the past and the future ages, resulting in man's incapacity for finding out, or comprehending the whole of what God doeth. This has resulted from the Fall.
their: i.e. the sons of men (Ecc_3:10).
God. Hebrew. Elohim.(with Art.) = the true God, or the Deity. App-4.
maketh = hath made, or done.
beginning to the end. The reason being given in Ecc_3:14. Man sees his own times of verses: Ecc_3:1-8; but what God doeth is from time past to time future (Ecc_3:14); so that man cannot find that out to the end from the beginning.
the end. Hebrew. soph. One of the words said to belong to later Hebrew, but it is found in 1Ch_20:16 ("conclusion"), and Joe_2:20 ("hinder part"). See also Ecc_7:2; Ecc_12:13, and App-76.