Sit in front of an object of concentration with the eyes open. Focus on a candle flame, or a yantra, a little dot, something small. Just look at it. Focus on it until there is nothing else in your mind. This develops willpower.
Frederick LenzPeople can insert thoughts into your mind. This is more dangerous for psychic people. Use concentration exercises and read to combat this; boredom is an easy way to be drained.
Frederick Lenz