with the interest. But the pure enthusiasm can come into them as they get more and more converted and purified and they then become very indispensable forces for the realisation.Sri Aurobindo
Letters of Sri Aurobindo
Volume II - Part 2
Fragment ID: 11461
As a rule, I mean in their unchanged condition, the lower parts get interested and enthusiastic [about work] when the ego mixes with the interest. But the pure enthusiasm can come into them as they get more and more converted and purified and they then become very indispensable forces for the realisation.