Psalm 105:4 Seek the Lord and His strength; Seek His face evermore!
When we speak of someone as being strong we often limit it to physical strength or emotional strength but God’s strength is without limit in all things making it a bit alien to our normal thinking.
We must never think of God as being limited in any manner because that is lowering Him from the position of being our God. In the time of King David the Ark was a symbol of that awesome power for the people to follow.
The Psalmist now encourages people not just to seek the power through the physical but also to seek a personal relationship with God to live with His power!