The person I spend most time talking to is me. Think about it, who do you spend most time with, and who do you listen to the most, almost all day every day. Our brain runs all the time and we think about something all the time and how we direct our thoughts is very important.
To motivate myself I use two simple line of thoughts
1 Think about: what I need to do, to get what I want to get
2 Think about the consequences of not doing what I suppose to do, and not getting what I want to get.
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Good luck! Focus on discipline rather than motivation is my advice!