Surely men of low degree are vanity - literally, “vanity are the sons of Adam,” but the word Adam here is used evidently to represent men, or the race. The same word is also employed particularly to represent common men, or men of the humbler rank, in contradistinction to the word אישׁ 'ı̂ysh - which is the other word used here, and rendered “men of high degree.” Compare, for this use of the word, Hosea 6:7. The same antithesis between the two words is found in Isaiah 2:9; Isaiah 5:15. The idea here is, that in the great matters which pertain to us, we cannot depend on men, and that our hope - our trust - must be in God. Of men of the humbler or lower classes, it is said that they are “vanity;” that is, they are like a vain, empty, unsubstantial thing. They cannot help us. It is useless to rely on them when we most need aid.
Men of high degree are a lie - Men of exalted rank, kings, princes, nobles. This does not refer to their personal character, as if they were always false, deceitful, treacherous; but the idea is, that any prospect of protection or aid from men of rank and station - front any power which they wield - is unworthy to be relied on. It is not that which we need; it is not that on which we can depend.
To be laid in the balance - literally, “In the scales to go up;” that is, they are seen to go up, or to show how light they are. They have no real weight; no real value. On the scales or balance, see the notes at Daniel 5:27.
They are altogether lighter than vanity - They are all vain; single or combined, they have no power to save us. The meaning is not that if these two ranks of persons were weighed against each other they would both be found to be vanity; but that it is true of each and every rank of men - high and low - whether single or combined - that, as weighed against our interests and needs, they are nothing. All the kings of the earth with all their hosts of war, all princes and nobles with all that they can summon from the lower ranks of their people, cannot save one soul from death - cannot deliver us from the consequences of our transgressions. God, and God alone, can do this.