The proverb "More haste, less speed" apparently means:
You make better progress with a task if you don't try to do it too quickly. Oxford Dictionary
What is the difference betwen 'haste' and 'speed' in this case? According to the same dictionary, 'haste' means:
Excessive speed or urgency of movement or action
Yet if the proverb advocates more haste, surely this means even more excessive speed. Why should one use more haste, which seems counter-intuitive?