1 As impure love inflames the mind, and summons the soul destined to perish to lust for earthly things, and to follow what is perishable, and precipitates it into lowest places, and sinks it into the abyss; so holy love raises us to heavenly things, and inflames us to what is eternal, and excites the soul to those things which do not pass away nor die, and from the abyss of hell raises it to heaven. Yet all love has a power of its own, nor can love in the soul of the lover be idle; it must needs draw it on. But do you wish to know of what sort love is? See where it leads...
Source: The Enarrations, or Expositions, on the Psalms (New Advent)