There is no progress in prayer without progress in faith, a purification of faith. And this entails the removal of all the props which depend on human endeavor, human reasoning, signs and the rest. It is the naked faith which is a terrifying experience and yet is the meeting point ultimately between God and ourselves in the depth of our being. This experience of the purification of faith is not normally one which comes early in the spiritual life. We must learn to wait.
We have the potential to become like a tree planted by the stream. Like the tree, we need nurturance — both of water and of sun if we are to blossom. We need nurturance from all the elements; without the soil, the sun, and the air, our food will not grow. We need nurturance from the plants. We all need human nurturance in the form of friendship and love, and we need God's own divine nurturance which empowers us to trust in the Author of creation.