How does Christ fill us up? By exposing the old attitudes and behaviors. False hopes, past regrets, the shame and guilt we've carried. By revealing to us things in our lives that no longer serve any purpose. By empowering us to gain those small victories in life where we move past our old life and grow in newness of life through Him.
A Spiritual Wilderness
All our easy crutches are stripped away when we face the raw forces or nature. The Israelites had to be tested and humbled in the wilderness before they could enter the Promised Land (Deu 8:2). Paul faced trials and difficulties in the wilderness (2 Cor 11:26). Most notably, Jesus was driven into the wilderness to be tempted (Matt 4:1-11). In these cases, the dangers of the wilderness became an outward symbol for the inner turmoil caused by the temptations of evil.