The Stoic pursuit of virtue was honest and so it had to lead them to truth and God.
That is why many of their ways and thoughts directly intersect with Christianity.
Like loving your fellow man:
'It is a man’s especial privilege to love even those who stumble. And this love follows as soon as you reflect that they are akin to you and that they do wrong involuntarily and through ignorance, and that within a little while both they and you will be dead; and this above all, that the man has done you no harm; for he has not made your “ruling faculty” worse than it was before. (Meditations, 7.22)'
"…who know moreover, that this transgressor, whosoever he be, is my kinsman, not by the same blood and seed, but by participation of the same reason, and of the same divine particle; How can I either be hurt by any of those, since it is not in their power to make me incur anything that is truly reproachful? or angry, and ill affected towards him, who by nature is so near unto me? for we are all born to be fellow-workers, as the feet, the hands, and the eyelids; as the rows of the upper and under teeth:for such therefore to be in opposition, is against nature;" (Meditations 1.15)