Spiritual development is crucial for our lives because it flows into our personal lives. We should be more aware the time we spend with God and why sometimes focusing too much on our personal development can become more egotistic rather than God glorifying. Nothing wrong with personal development as we all should be doing, but sometimes it becomes an idol and life becomes all about us. The danger here is we begin to lose the passion and fellowship we once had with Christ. Spiritual development is important because it affects every aspect of your life.