Friendship with God is unavailable to those who find the idea incredible and/or despair of it

"just as friendship with a person would be impossible if one disbelieved in, or despaired of, the possibility of his fellowship or familiar intercourse, so too, friendship with God, which is charity, is impossible without faith, so as to believe in this fellowship and intercourse with God, and to hope to attain to this fellowship."

"sicut aliquis non posset cum aliquo amicitiam habere, si discrederet vel desperaret se posse habere aliquam societatem vel familiarem conversationem cum ipso; ita aliquis non potest habere amicitiam ad Deum, quae est caritas, nisi fidem habeat, per quam credat huiusmodi societatem et conversationem hominis cum Deo, et speret se ad hanc societatem pertinere."

     St. Thomas Aquinas, Summa theologiae I-II.65.5.Resp., in the FEDP (or Shapcote) translation.  On the other hand, the requisite faith and hope must be infused!

Faith and works

"Deus, innocentiae restitutor et amator, dirige ad te tuorum corda servorum:  ut, spiritus tui fervore concepto, et in fide inveniantur stabiles et in opere efficaces."

God, restorer and lover of innocence, direct the hearts of [your] servants to you, in order that, seized by the fervor of your Spirit, they may be found steadfast in faith and effectual in deed.

     Prayer for Thursday of the Second Week in Lent, Liturgy of the hours.  Corpus orationum =Bruylants, no. 235 on p. 72 of vol. 2.  From the 9th century, but the incipit ("Deus, innocentiae restitutor et amator, dirige ad te tuorum corda") from the earlier Gelasian.  On the other hand, shouldn't concepto, if modifying servorum (genitive masculine plural) or corda (accusative neuter plural), be plural?   For what else could concepto be modifying?  Innocentia?  But innocentia would require concepta.
     Universalis:

God of love, bring us back to you.  Send your Spirit to make us strong in faith and active in good works.