Sadhu Sundar Singh (1889-1929) wrote in A Sadhu's Wisdom
Dolphins can live in the deepest water without danger because they regularly come to the surface and take in the air that sustains them. We, too, must rise in prayer into the spiritual realm. To pray is to breathe in God's life-giving spirit that gives life and peace, even in this world.
The new-born child needs no instruction in drinking, but instinctively turns to its mother's breast for nourishment. For her part, the mother withholds no good gift from her child, but still the child cannot receive the mother's milk without effort. In the same way, we are carried at God's breast, but we must turn to God in prayer for the spiritual milk that sustains our souls.
The root tips of trees are so sensitive and responsive that they instinctively turn away from places where there is no nourishment and spread themselves instead in places where they can drink in moisture and life.
I have seen green and fruitful trees standing in the middle of a dry and barren desert. These trees survive and flourish because their roots have driven down and discovered hidden streams of flowing water.
Some people live in the midst of evil and misery but still radiate joy and lead fruitful lives. Through prayer, the hidden roots of their faith have reached down to the source of living water. They draw from it energy and life to bear spiritual fruit. If we lead active lives of prayer, we will also gain the spiritual discernment to turn away from illusion and evil and to find the truth we need for life.