An almost Christian, if we consider him in respect to his duty to God, is one that halts between two opinions; that wavers between Christ and the world; that would reconcile God and Mammon, light and darkness, Christ and Belial.
It is true, he has an inclination to religion, but then he is very cautious lest he go too far in it: his false heart is always crying out, Spare thyself, do thyself no harm.
He prays indeed that ‘God’s will may be done on earth, as it is in heaven.’ But notwithstanding, he is very partial in his obedience, and fondly hopes that God will not be extreme to mark every thing that he willfully does amiss; though an inspired apostle has told him, that ‘he who offends in one point is guilty of all.’
But chiefly, he is one that depends much on outward ordinances, and on that account looks upon himself as righteous, and despises others; though at the same time he is as great a stranger to the divine life as any other person whatsoever.
In short, he is fond of the form, but never experiences the power of godliness in his heart.
(HT: Dane Ortlund)