This from the Bible Illustrator, on 1 Cor 16.14:
As means towards the attainment of the best ends there is no comparison between these. The latter [logic] may convince the understanding and leave the heart unchanged, but the former [love] will win the heart, and with that gained, the understanding will usually soon succumb.
The difference between them is similar to that between a mallet and the sun in reducing ice to water. The mallet may break the ice into small particles, but each particle will remain ice still, while the sun’s heat falling upon the ice will melt it into a fluid, and so impregnate the fluid with its warmth that while that warmth is continued the water cannot assume again its icy condition.
So in changing opinions and reforming habits. Arguments will be of little avail without a loving disposition behind them. The opinions, after all cold pure arguments, will remain generally unchanged, or probably assume another false complexion, and the habits, if broken up for a little, will soon resume their wonted round.
But if love prevails, the eyes looking it, the face beaming it, the words expressing it, the whole demeanour demonstrating it, the citadel of opinion will melt before the loving assault, and the heart will become ablaze with the sacred glow.
Love and logic should at least go hand in hand in seeking the regeneration of the world.