The left side of the crest is the Crest for the Diocese of Townsville, symbolising Mary Help of Christians. The Fleur-de-lis in Catholic Heraldry is a sign of Mary. The battlements are a sign of protection and help, and also symbolise Castle Hill. The Southern Cross symbolises Christians

The right side of the crest is Bishop Michael Putney's Coat of Arms. The Bishop's episcopal motto is taken from Zephaniah 3:17 which promises that God will exult over his people, whom he will renew in his love. Hence in 3:15-16 we are urged to fear no more and not to let our arms grow weary.

The coat of arms, therefore, pictures the Holy Spirit renewing the church, which is carried across the sea of life and history by Christ who died to give it birth. The ancient ship is the church. Justin Martyr (c.100-c.165) described the cross as the mast of the church without which it would not be able to move.

The three persons of the Triune God each play their part in the birth and renewal of the church and in its future which is full of hope.

The depiction of the church in this way also alludes to the ecumenical movement which is often symbolised in a similar manner.