Can you forgive an injury, or take an affront, as Christ did? Can you be censured for doing well, and not murmur? Can you be misjudged and misrepresented, and yet keep a Christ-like spirit?
Another good test is to read Galatians 5, and notice the fruits of the Spirit; and see if you have them.
“The fruit of the Spirit is love, joy, peace, long-suffering, gentleness, goodness, faith, meekness, temperance: against such there is no law.”
If I have the fruits of the Spirit I must have the Spirit. I could not have the fruits without the Spirit any more than there could be an orange without the tree. And Christ says “Ye shall know them by their fruits;” “for the tree is known by his fruits.”
Make the tree good, and the fruit will be good. The only way to get the fruit is to have the Spirit. That is the way to examine ourselves whether we are the children of God.