Whoso removeth stones - This verse teaches care and caution. Whoever pulls down an old building is likely to be hurt by the stones; and in cleaving wood many accidents occur for want of sufficient caution.
The figures seem to be taken from the work of building up and pulling down houses. In their general application, they recommend the man who would act wisely to be cautious when taking any step in life which involves risk.
Ecclesiastes 10:8
Breaketh an hedge - Rather: “breaks through a wall.”
Serpent - The habit of snakes is to nestle in a chink of a wall, or among stones (compare Amos 5:19).
Ecclesiastes 10:9
Be endangered - Rather: “cut himself.”