133:1 A Song of the Ascents, by David. Lo, how good and how pleasant The dwelling of brethren--even together!
133:2 As the good oil on the head, Coming down on the beard, the beard of Aaron, That cometh down on the skirt of his robes,
133:3 As dew of Hermon--That cometh down on hills of Zion, For there Jehovah commanded the blessing--Life unto the age!
The verse centers on "song", "ascents", "david", "good", "pleasant", "dwelling", "brethren--even", and "together". It is saying that the verse draws attention to "song" and "ascents", so its meaning should be read from those terms before moving to application.
The local YLT text gives this verse as the immediate unit, so "song" and "ascents" carries the first interpretive weight. In Psalms context, the local focus is worship, trust, the LORD's kingship, and covenant mercy.
A plain takeaway is to answer the verse's own emphasis on "song" and "ascents" with trust shaped by these words, not by a vague optimism outside the passage.