The soul never worketh better than in the strength of some eminent affection. In all things that we take in hand we do but so-so, act but chilly and weakly, while we have a listless and remiss will; but when the force of affection is upon us, the soul is carried on strongly, either in abomination or prosecution; for affections are the forcible and vigorous motions of the will. Now the soul never doth well but under such an affection. Were it not for affections, our nature would be sluggish and idle … The ship moveth slowly when there are no winds stirring to fill the sails; or like a chariot without wheels or horses, or a bird when her wings are clipped. They spur us on to what we affect. Men are heavy and lazy because they have no affection: Exod. 36:2, ‘And Moses called Bezaleel and Aholiab and every wise-hearted man, in whose heart the Lord had put wisdom, even every one whose heart stirred him up to come unto the work to do it.’ Man findeth a force within himself, his heart maketh him willing; the stronger the affections, the better the man acteth, with greater strength and vivacity; for they are the vigorous motions of the will.
The Complete Works of Thomas Manton, (London: James Nisbet & Co., 1872), 8:358–359.