"5. What is it, therefor, that a soul truly called by God to enter into religion look for? Surely not corporal labours; not the use of the sacraments; nor hearing of sermons, &c. For all these she might have enjoyed perhaps more plentifully in the world. It is, therefore, only the union of the spirit with God by recollected, constant prayer; to the attaining which divine end all things practiised in religion do dispose, and to which alone so great impediments are found in the world.
6. The best general proof, therefore, of a good call to religion is a love to prayer, either vocal or mental. For if at first it be only to vocal prayer, by reason that the soul is ignorant of the effcacy and excellency of internal contemplative prayer, or perhaps has received some prejudices against it; yet if she observe solitude carefully, and with attention and fervour practise vocal prayer, she will in time, either by a divine light perceive the necessity of joining mental prayer to her vocal, or be enabled to practice her vocal prayer mentally, which is sublime perfection.
It is a state, therefore of recollectedness and introversion that every one entering into religion is to aspire unto, which consists in an habitual disposition of soul, whereby she transcends all creatures and their images, which thereby come to have little or no dominion over her, so that she remains apt for immediate cooperation with God, receiving His inspirations, and by a return, and, as it were, a reflux, tending to Him and operating to His glory.
It is called recollectedness, because the soul in such a state gathers her thoughts, naturally dispersed and fixed with multiplicity on creatures, and unites them upon God. And it is called introversion, both because the spirit and those things which concern it, being the only object that a devout soul considers and values, she turns all her solicitudes inwards to observe defects, wants, or inordinations there, to the end she may remedy, supply, and correct them; and likewise, because the proper seat, the throne and kingdom where God by His Holy Spirit dwells and reigns, is the purest summit of man's spirit. There it is that the soul most perfectly enjoys and contemplates God, though everywhere, as in regard of Himself, equally present, yet in regard of the communication of His perfections present there, after a far more noble manner than in any part of the world besides, inasmuch as He communicates to the spirit of man as much of His infinite perfections as any creature is capable of, being not only simple Being, as He is to inanimate bodies; or Life, as to living creatures; or Perception, as to sensitive; or Knowledge, as to other ordinary rational souls: but with and besides all these, He is a divine light, purity, and happiness, by communicating the supernatural graces of His Holy Spirit to the spirits of His servants. . ." pg. 150, 151 Father Baker "Holy Wisdom"