There are certain acts by doing which one person enjoys happiness in Time's course. By doing those very acts another reaps misery in the course of Time.
यान्येव पुरुषः कुर्वन् सुखैः कालेन युज्यते॥ पुनस्तान्येव कुर्वाणो दुःखै कालेन युज्यते।