Westminster Larger Catechism

The duty of Christians, after they have received the sacrament of the Lord's supper, is seriously to consider how they have behaved themselves therein, and with what success;¹¹²⁷ if they find quickening and comfort, to bless God for it,¹¹²⁸ beg the continuance of it,¹¹²⁹ watch against relapses,¹¹³⁰ fulfill their vows,¹¹³¹ and encourage themselves to a frequent attendance on that ordinance:¹¹³² but if they find no present benefit, more exactly to review their preparation to, and carriage at, the sacrament;¹¹³³ in both which, if they can approve themselves to God and their own consciences, they are to wait for the fruit of it in due time:¹¹³⁴ but, if they see they have failed in either, they are to be humbled,¹¹³⁵ and to attend upon it afterwards with more care and diligence.¹¹³⁶