Road to hell is paved with good intentions - The.
Money doesn't grow on trees.
Whole is greater than the sum of the parts - The.
The best-laid schemes of mice and men gang aft agley Link to proverb.
It's all grist to the mill Link to proverb.
It's no use shutting the stable door after the horse has bolted Link to proverb.
The proof of the pudding is in the eating.