So is your thought, so is you. If your thoughts are good, you are good; if they are bad, you are bad.
We rarely think and act consciously. Animals have no choice and simply live by instinct. On the contrary, human beings should be conscious of whatever they are doing, because they do have a choice, discrimination, intelligence, and rationality. How to carry out all activities in consciousness? Spiritual life is a conscious lifestyle and it begins with conscious breathing. If you watch your breath and you are conscious of each inhalation and exhalation, you will be conscious of each thought and activity. Breath is constantly going in and out in the background of all your activities. If you are conscious of your breath, and if you constantly watch your breath, you will succeed in being conscious of all your thoughts and all your activities.
You attained this rare human birth. You have the desire for evolution. You have accepted the path of Yoga. Practise purity. Let all your perceptions be pure. Let all your thoughts be pure. Let all your activities be pure. Then you are close to the goal – self-realization is at hand.