" The rajasic person is full of energy; the tamasic person is sluggish, indifferent, insensitive; the sattvic person, calm, resourceful, compassionate, and selfless. Yet all three are always present at some level of awareness, and their proportions change: their interplay is the dynamics of personality. The same individual will have times when he is bursting with energy and times when inertia descends and paralyzes his will, times when he is thoughtful and other times when he is moving so fast that he never notices those around him. The person is the same; he is simply experiencing the play of the gunas. As long as he identifies with his body and mind, he is at the mercy of this play. "

― Krishna-Dwaipayana Vyasa , The Bhagavad Gita