Mark 4:24-25

Be careful how you judge and measure other people.  That is how you yourself will be judged and measured.

This demands an incredibly transparent, honest self-assessment.

Matthew Henry suggests that in verse 25, Jesus is making a "use it or lose it" spiritual comment.  If you have a great deal of spiritual insight and use it wisely, your investment will grow.  If you have little spiritual understanding and don't work to improve it, you'll lose what little you have to begin with.