“Now when He was in Jerusalem at the Passover, during the feast, many believed in His name, observing His signs which He was doing. But Jesus, on His part, was not entrusting Himself to them, for He knew all men, and because He did not need anyone to testify concerning man, for He Himself knew what was in man.” John 2:23-25.
“Do not trust in princes,
In mortal man, in whom there is no salvation.” Psalm 146:3.
There are those who sincerely believe in Christ, but they want to dictate and micro-manage the mission of others.
Jesus’ disciple Peter was an example. Peter believed in Christ, but there was a time when Peter wanted to dictate and micro-manage the mission of Jesus.
“From that time Jesus began to show His disciples that He must go to Jerusalem, and suffer many things from the elders and chief priests and scribes, and be killed, and be raised up on the third day. Peter took Him aside and began to rebuke Him, saying, “God forbid it, Lord! This shall never happen to You.” But He turned and said to Peter, “Get behind Me, Satan! You are a stumbling block to Me; for you are not setting your mind on God’s interests, but man’s.” Matthew 16:21-23.
In other words, there are many good things that we can do, and other Christians often try to make us do the good that they want according to their own interests and agenda. But, we only have time for the best, and we need to focus on the best and do what we have been uniquely gifted by God and prepared by God and guided by God to do.
There are also those family members and close friends who appear to believe in Christ and who appear to believe in us, but they sincerely do neither.
“He came to His own, and those who were His own did not receive Him.” John 1:11.
“Is not this the carpenter’s son? Is not His mother called Mary, and His brothers, James and Joseph and Simon and Judas? And His sisters, are they not all with us? Where then did this man get all these things?” And they took offense at Him. But Jesus said to them, “A prophet is not without honor except in his hometown and in his own household.” And He did not do many miracles there because of their unbelief.” Matthew 13:55-58.
“For Jesus knew from the beginning who they were who did not believe, and who it was that would betray Him. And He was saying, “For this reason I have said to you, that no one can come to Me unless it has been granted him from the Father.”
As a result of this many of His disciples withdrew and were not walking with Him anymore.” John 6:64-66.
And, there are also others who really do not believe in Christ and they simply want to lead us astray or do just secular things.
Generally, Jesus understood the heart of man and did not entrust Himself to man.
“But Jesus, on His part, was not entrusting Himself to them, for He knew all men, and because He did not need anyone to testify concerning man, for He Himself knew what was in man.” Verses 24-25.
“The heart is more deceitful than all else
And is desperately sick;
Who can understand it?” Jeremiah 17:9.
Reformed Doctrine label it “Total Depravity”.
We should trust God, not man.
“8 It is better to take refuge in the LORD
Than to trust in man.
9 It is better to take refuge in the LORD
Than to trust in princes.” Psalm 118:8-9.
“5 Thus says the LORD,
“Cursed is the man who trusts in mankind
And makes flesh his strength,
And whose heart turns away from the LORD.
6 “For he will be like a bush in the desert
And will not see when prosperity comes,
But will live in stony wastes in the wilderness,
A land of salt without inhabitant.
7 “Blessed is the man who trusts in the LORD
And whose trust is the LORD.
8 “For he will be like a tree planted by the water,
That extends its roots by a stream
And will not fear when the heat comes;
But its leaves will be green,
And it will not be anxious in a year of drought
Nor cease to yield fruit.” Jeremiah 17:5-8.