The next time you run into an obstacle and feel resistance, don't look at what's around you. Instead, look within.

It is not outside forces that make us feel something, it is what we tell ourselves that create our feelings.

"Choose someone whose way of life as well as words, and whose very face as mirroring the character that lies behind it, have won your approval. Be always pointing him out to yourself either as your guardian or as your model. This is a need, in my view, for someone as a standard against which our characters can measure themselves. Without a ruler to do it against you won't make the crooked straight." - Seneca, Letters From a Stoic