I recently had a conversation with a wise, elderly lawyer. He reminded me of some things in law which are applicable to our ordinary daily lives even when we are not practicing lawyers.
Do not believe everything your client tells you. Your first task is to know the truth in order to better defend/represent your client within the bounds of the law.
Verify everything. Documents may be faked. Signatures may be forged. Anything can be faked.
Be wary of hearsay. Statements could always be altered written or unwritten depending on the storyteller. Remember the general rule: hearsay is inadmissible as evidence in court.
Choose your battles wisely and humbly. If yours is a losing case, be humble enough to amicably settle out of court. If yours is a winning case, be humble enough to FIRST try to amicably settle out of court. Litigation should only be a last resort.
Do not run away with your emotions. Always be objective because emotions undeniably cloud sound judgments.