“Now set your mind and heart to seek the Lord your God.”
Seeking the Lord means seeking his presence. “Presence” is a common translation of the Hebrew word “face.” Literally, we are to seek his “face.” But this is the Hebraic way of having access to God. To be before his face is to be in his presence.
But aren’t his children always in his presence? Yes and no. Yes in two senses: First, in the sense that God is omnipresent and therefore always near everything and everyone. He holds everything in being. His power is ever-present in sustaining and governing all things.
And second, yes, he is always present with his children in the sense of his covenant commitment to always stand by us and work for us and turn everything for our good. “Behold, I am with you always, to the end of the age” (Matthew 28:20).
[John Piper, Desiring God, What Does It Mean To Seek The LORD?]