At first, the ratio of health-to-mana is 2:1, meaning for every health point, 200% of that gets taken by your mana. If you invest points in Telekinesis, each level therein will increase the effectiveness of Energy Shield by 6.25%, and by the time Telekinesis reaches level 16, you'll be at a 1:1 ratio of health damage per magic damage. That isn't to say go cram a bunch of points in to Telekinesis, but only hard points spent in the skill are considered for Synergy bonuses.
From diablo wiki