Man is often his own worst enemy.
Because thou sayest, I am rich, and increased with goods, and have need of nothing; and knowest not that thou art wretched, and miserable, and poor, and blind, and naked: (Revelation 3:17 KJV)
Mankind is boastful and naturally proud, according to the darkened nature of his heart from birth. Man likes to speak out about his own ability to provide for himself. He is naturally self-reliant and resourceful, without considering all things have come from the hand of God. The natural man likes to take credit for supplying his own needs through hard work and a generous paying career as he deftly skirts up the ladder of financial success able to fill his life with anything he could possible need or desire.
However, man cannot buy what it takes to fulfill his inmost desire. Only God can bring about spiritual satisfaction silencing his heart. Trying to satisfy oneself with things of this world, rather than possessing a personal relationship with God, is like trying to fill a round hole with a square peg. Things of this world never quench the spiritual desire for God.
Only when mankind comes to the end of himself does he reach out for the things of God. Mankind, left to himself, is wretched, miserable, poor, blind, spiritually naked, and utterly helpless without having the supernatural Spirit of God dwelling inside of His heart as he sojourns in this world.