Spiritual maturity is not reached by the passing of the years, but by obedience to the will of God. Some people mature into an understanding of God’s will more quickly than others because they obey more readily; they more readily sacrifice the life of nature to the will of God; they more easily swing clear of little determined opinions. It is these little determined opinions, convictions of our own that won’t budge, that hinder growth in grace and makes us bitter and dogmatic, intolerant, and utterly un-Christlike.
— Oswald Chambers