What is the key to patience?

Hi everyone, this is my first post and I have looked through the site to find relevant content on patience but the lesson applies to so many parts of our lives, I thought I would start a discussion. 

I am going through some in-betweens in life and I’m pretty sure my current test and lesson are patience. Whilst trying to spiritually grasp the situation and keep a ‘focus on what is’ approach, I am also impatient with the end goals in mind which doesn’t keep me grounded. 

My question is, how do you become a more patient person and what is the lesson you think it teaches us?

Thanks! 

Trish