Bruce Wilkinson's book, Secrets of the Vine, suggests that there are many barriers to producing agape love. Lack of love is the biggest problem the greater church of God struggles with today. We find it difficult to love our brethren as Christ loved us because we do not want to expose our vulnerability, which is anchored to self-focused pride. Peter sank in his abortive walk on the water because his sense of vulnerability eroded away the needed faith for this act. Only when we sacrifice our sense of vulnerability and our penchant for pride will we have the strength to yield to God.