Understanding 'Surge of Enthusiasm'

In many regions, the arrival of spring is associated with a revival of energy and life in nature. Trees begin to sprout new leaves, flowers bloom brightly, and animals emerge from their winter slumber. This season signifies renewal and growth, prompting individuals to engage in outdoor activities after months of cold weather. With the warmth of the sun returning, people often feel a surge of enthusiasm to start new projects, both at work and in their personal lives. As gardens come back to life, gardeners eagerly prepare the soil, sow seeds, and hope for a bountiful harvest. In this context, the phrase 'surge of enthusiasm' refers to a feeling of: