Ostriches never fly, hens fly sometimes but clumsily and not very high, but eagles, doves and swallows soar upwards swiftly and frequently. In the same way sinners never fly towards God but travel on the earth seeking only earthly things. Those who are good but not yet devout do fly sometimes on the wings of good deeds, but slowly and ungracefully. Those who are devout soar on high to God frequently and readily.
- St Francis de Sales, Introduction to the Devout Life