Dr Lloyd-Jones on Unction in Preaching

"Seek Him! Seek Him! What can we do without Him? Seek Him! Seek Him always. But go beyond seeking Him, expect Him. Do you expect anything to happen to you when you get up to preach in a pulpit? Seek this power, expect this power, yearn for this power; and when this power comes, yield to Him. Do not resist. Forget all about your sermon if necessary. Let Him loose you, let Him magnify His power in you and through you".

Dr Martyn Lloyd-Jones - "Preaching and Preachers" - Hodders (1971) - (p325).