Have you ever desired or craved something so much that your whole being longed to have it? That is how we should long for the Lord. Our love for God should give us a desire to be with Him at all times. If you do not have this desire, ask the Lord to grow your love for Him.
“How lovely is Your tabernacle, O LORD of hosts! My soul longs, yes, even faints For the courts of the LORD; My heart and my flesh cry out for the living God.” Psalm 84:1-2