For there is a man whose labour hath been with wisdom, and with knowledge, and with skill, and who leaveth it to a man that hath not laboured therein, to be his portion. This also is vanity and a great evil.

I have seen that every [effort in] labor and every skill in work comes from man’s rivalry with his neighbor. This too is vanity (futility, false pride) and chasing after the wind.

I returned, and saw under the sun, that the race is not to the swift, nor the battle to the strong, neither yet bread to the wise, nor yet riches to men of understanding, nor yet favour to men of skill; but time and chance happeneth to them all.

If the axe is blunt, and one doesn't sharpen the edge, then he must use more strength; but skill brings success.