Sometimes the flame of a lamp can leap up and burn furiously. At other times it burns gently and quietly. Sometimes its light leaps up and emits a great radiance. At other times its small flame gives out only a dim light. This is how it is with the lamp of grace in the soul. It is always lit and giving off illumination, but when it burns with special radiance, it is as if the soul were drunk with love for God. At other times, as God himself decides, the light is still there but it is only a dim glow.
–Saint Macarius the Great (c. 300-391)