Trump sees some truth in everything he says. If you look at many of his insults, lies and gaffes
The 37 Fatal Gaffes That Didn’t Kill Donald Trump "Biden's gaffes pale by comparison to Trump's lies and even more egregious gaffes. Colonial airfields, Sharpie altered weather maps, 15 flush toilets and windmill oncology, for starters." https://investorshub.advfn.com/boards/read_msg.aspx?message_id=155222046
there is no doubt that Trump meant what he said. As for his three most repeated lies
Trump’s top three most-repeated claims have remained the same.
His most repeated claim — 291 times — is that the U.S. economy today is the best in history. He began making this claim in June 2018, and it quickly became one of his favorites. As we noted, he’s trying to update it in the wake of the economic swoon. The president once could brag about the state of the economy, but he ran into trouble when he made a play for the history books. By just about any important measure, the pre-coronavirus economy was not doing as well as it did under Presidents Dwight D. Eisenhower, Lyndon B. Johnson or Bill Clinton — or Ulysses S. Grant. Moreover, the economy already was beginning to hit the head winds caused by Trump’s trade wars, with the manufacturing sector in an apparent recession. AD
In fact, his second-most-repeated claim — 257 times — is that his border wall is being built. Congress balked at funding the concrete barrier he envisioned, so the project evolved into the replacement of smaller, older barriers with steel bollard fencing. The Washington Post has reported the bollard fencing is easily breached, with smugglers sawing through it, despite Trump’s claims it is impossible to get past. Nevertheless, the project has diverted billions in military and counternarcotics funding to become one of the largest infrastructure projects in U.S. history, seizing private land, cutting off wildlife corridors and disrupting Native American cultural sites.
Lately, Trump has once again begun falsely claiming the Mexico is paying for the border barrier, even though he had to raid the federal Treasury and delay military construction projects to obtain funding over Congress’s objections. And he has used the coronavirus outbreak to justify his push for the barrier, even though the director of the Centers for Disease Control and Prevention and other public health experts say they haven’t seen evidence it can stop the virus from spreading.
Trump has falsely said 197 times that he passed the biggest tax cut in history. Even before his tax cut was crafted, he promised it would be the biggest in U.S. history — bigger than President Ronald Reagan’s in 1981. Reagan’s tax cut amounted to 2.9 percent of the gross domestic product, and none of the proposals under consideration came close to that level. Yet Trump persisted in this fiction even when the tax cut was eventually crafted to be the equivalent of 0.9 percent of gross domestic product, making it the eighth-largest tax cut in 100 years. This continues to be an all-purpose applause line at the president’s rallies. https://www.washingtonpost.com/politics/2020/04/14/president-trump-made-18000-false-or-misleading-claims-1170-days/
Trump must before now know those are lies. He just doesn't care he is lying. He has lied to himself and to others all his working life so it is 2nd nature to him. No, for Trump it is more probably first nature to lie about anything which could reflect negatively on himself.
No doubt Trump is no more than a fully corrupted individual.