"To understand the truth" means to comprehend or have knowledge about what is real, accurate, or factual. It involves gaining insight or clarity about something that may have been unknown or misunderstood before. Full definition
Great faith is fully convinced of the difficult promises and the hard to understand truths of Scripture. (redeeminggod.com)
When you start using life insurance quotes, you will quickly understand the truth in the saying that not all policies are created equal. (usinsuranceagents.com)
You obviously don't understand the truth or joyful freedom of atheism. (religion.blogs.cnn.com)