"one of T.E.Lawrence’s all important “dreamers of the day”"

Bear Grylls is referring to a passage in The Seven Pillars of Wisdom, T.E. Lawrence's inspirational book about his experiences in the Arabian desert:

All men dream, but not equally. Those who dream by night in the dusty recesses of their mind wake in the day to find that it was vanity but the dreamers of the day are dangerous men, for they may act their dreams with open eyes, to make it possible.