Besides Christ there is nothing else to be confident in. The ups and downs of life show us that nothing in life is consistent except Him. Everything else changes in some way! Finances fluctuate, relationships come and go, even people change over time. But God is always the same. His nature never changes; He always faithful, always loving, always honest, and always true.
Before his bold claim in Philippians 4:13 Paul said that he knew how to be abased and how to abound (4:12). Paul knew what it meant to run low and to overflow. From well-respected and loved to outcast and beaten repeatedly; his life had been through some drastic changes. He claimed confidence in Christ in the midst of it all. Why? Because Christ was always faithful. Take a good look at your life and you’ll notice the same. Be confident in Christ and no one else!