Verse 4
Seek the Lord - Worship the one only Supreme Being, as the only and all-sufficient good for the soul of man.
And his strength - Man is weak; and needs connection with the strong God that he may be enabled to avoid evil and do good.
Seek his face - Reconciliation to him. Live not without a sense of his favor.
Evermore - Let this be thy chief business. In and above all thy seeking, seek this.