There's some truth to that. When I am strict on myself, the restriction of others or circumstances doesn't seem that difficult. When I discipline and complete my tasks daily, I am carefree and feel more confident in myself.
But the rule is to know myself and not assign too much work for a given time.
Also, give praise to self and believe in self. It's all about the mindset.
I am happy with my day. I do my daily routine. It seems like I'm not growing, but I know I'm pipping my pump of whatever I'm building, which has no shape nor form yet.