Samuel Rutherford (Letters of Samuel Rutherford, Edinburgh; London: Oliphant, Anderson & Ferrier, 1891, p. 511).
[T]ake pains to climb up to that besieged house to Christ; for devils, men, and armies of temptations are lying about the house, to hold out all that are out, and it is taken with violence. It is not a smooth and easy way, neither will your weather be fair and pleasant; but whosoever hath seen the invisible God, and the fair City, makes no reckoning of losses or crosses. Read the full excerpt here.