Jesus knew who believed not
Worry about Tomorrow or faith for the future
The golden rule for understanding spiritually is not intellect, but obedience. If a man wants scientific knowledge, intellectual curiosity is his guide; but if he wants insight into what Jesus Christ teaches, he can only get it by obedience. If things are dark to me, then I may be sure there is something I will not do. Intellectual darkness comes through ignorance; spiritual darkness comes because of something I do not intend to obey.
No man ever receives a word from God without instantly being put to the test over it. We disobey and then wonder why we don’t go on spiritually.