Love is nothing but the prime motion of the will to its proper object; which is called complacence: the object of it is simple goodness, or good as such it ariseth from suitableness between the object and the will, as, appetite doth from the suitableness of the desired fancy and food. This good, as it is variously modified, or any way differeth, doth accordingly cause or require a difference in our love therefore that love which in its prime net and nature is but one, is diversely denominated, as its objects are diversified. To an object as simply good, in itself, it followeth the understanding's estimation, and is called, as I said, mere complacence or attachment: to an object as not yet attained, but absent, or distant, and attainable, it is called desire or desiring love: and as expected, hope, or hoping love (which is a conjunction of desire and expectation): to an object nearest and attained, it is called fruition, or delight, or delighting love: to an object which by means must be attained, it is called seeking love, as it exciteth to the use of those means: and to an object missed it is, by accident, mourning love. But still love itself in its essential act is one and the same. As it respecteth an object which wanteth something to make it perfect, and desireth the supply of that want, it is called love of benevolence; denominated from this occasion, as it desireth to do good to him that is loved. And it is a love of the same nature which we exercise towards God, who needeth nothing, as we rejoice in that perfection and happiness which he hath; though it he not to be called properly by the same name. Goodness being the true object of love, is the true measure of it; and therefore God, as infinitely and primitively good, is the prime and only simple object of our absolute, total love. And therefore those who understand no goodness in any being, but as profitable to them, or to some other creature, do know no God, nor love God as God, nor have any love but selfish and idolatrous. By this you may perceive the nature of love.
From the Cases and Directions for Loving our Neighbour as Ourselves.