The parable of the ten virgins sheds 'light' on this.
Five of them were foolish, and five were wise. The foolish one took their lamps but did not take along any extra oil. But the wise one took oil in vessels along with their lamps...
Everyone had their lamp, but only the wise thought it prudent, I'd say as much even as necessary, that the foolish, obviously, must've thought otherwise, to keep (the) vessel which carried extra oil. The vessel which, subsequently, is associated to the bridegroom's intimate knowledge of them, especially considering that he responds to the foolish' plead that he open the door to them with the answer, "I never knew you."
So, although everyone can appreciate the significance of 'the lamp,' not everyone recognizes the import of 'the vessel' which carries extra oil for the lamp.
Using a similar explanation of this analogy to answer the op, these that have not seen the form of the father have not seen (the form of) the lamp tho they have the express evidence (an other form of) it exists right before their very eyes.
Five of them were foolish, and five were wise. The foolish one took their lamps but did not take along any extra oil. But the wise one took oil in vessels along with their lamps...
Everyone had their lamp, but only the wise thought it prudent, I'd say as much even as necessary, that the foolish, obviously, must've thought otherwise, to keep (the) vessel which carried extra oil. The vessel which, subsequently, is associated to the bridegroom's intimate knowledge of them, especially considering that he responds to the foolish' plead that he open the door to them with the answer, "I never knew you."
So, although everyone can appreciate the significance of 'the lamp,' not everyone recognizes the import of 'the vessel' which carries extra oil for the lamp.
Using a similar explanation of this analogy to answer the op, these that have not seen the form of the father have not seen (the form of) the lamp tho they have the express evidence (an other form of) it exists right before their very eyes.