The last thing Jesus told the eleven disciples according to Matthew 18:20 was "Behold, I am with you always, until the end of the age." Since the Lord knows everything about each one of us, of course he is with us. Even if we do not see him, we can be sure that he is more present than all others whom we know and see. In fact, after you receive Holy Communion, he even dwells in us. This is faith at its best.