Then thou shalt see, and flow together, and thine heart shall fear, and be enlarged; because the abundance of the sea shall be converted unto thee, the forces of the Gentiles shall come unto thee.
Then thou shalt see (Isaiah 60:4) - namely, the bringing back of thy sons.
And flow together (Hebrew, naharte) - literally, to flow as a river. Thou shalt" - i:e., thy children shall flow together from all lands (cf. Isaiah 66:12). Or else, 'overflow with joy' (Lowth); or else, in the Chaldaic sense, akin to the Hebrew root, nuwr (H5135), 'be bright (with joy)' (Gesenius). (Job 3:4; Psalms 34:5.) So the Chaldaic, Syriac, and Arabic; but the Vulgate, 'afflues.'
And thine heart shall fear (Hebrew, phachad) - or, beat with the agitation of solemn joy at the marvelous sight (Horsley). Jeremiah 33:9, "they shall fear and tremble for all the goodness, and for all the prosperity that I procure unto it."
And be enlarged - swell with delight. Grief, on the contrary, contracts the heart.
Because the abundance of the sea shall be converted (i:e., turned) unto thee. The wealth of the lands beyond the sea, as in Solomon's time, the type of the coming reign of the Prince of Peace, instead of being turned to purposes of sin and idolatry, shall be turned to minister to the Lord and His people.
The forces - rather, the riches.