Adam Clarke on Psalms 67:2

That thy way may be known - That thy will, thy gracious designs towards the children of men, thy way of reconciling them to thyself, of justifying the ungodly, and sanctifying the unholy, may be known to all the nations upon the earth! God's way is God's religion; what he walks in before men; and in which men must walk before him. A man's religion is his way of worshipping God, and going to heaven. The whole Gospel is called this way, Act 19:9.

Thy saving health - ישועתך yeshuathecha, "thy salvation." The great work which is performed in God's way, in destroying the power, pardoning the guilt, cleansing from the infection, of all sin; and filling the soul with holiness, with the mind that was in Christ. Let all nations - the whole Gentile world, know that way, and this salvation!