‘Try not to resist the changes that come your way. Instead let life live through you. And do not worry that your life is turning upside down. How do you know that the side you are used to is better than the one to come?’
I quoted Dr Norman Vincent Peale at the start of this post. Here's some great advice from him on the subject of developing an untroubled mind: ‘Sit still, be silent, let composure creep over you.' That's all you have to do. Get the body still first, then the mind will follow. Do that many times a day if necessary. Sit still. Be silent. And let---please note that word 'let'---composure creep over you. The Theravāda Buddhist leader and teacher of the Buddhadhamma Ajahn Chah said more-or-less the same thing:
'Do not try to become anything. Do not make yourself into anything. Do not be a meditator. Do not become enlightened. When you sit, let it be. When you walk, let it be. Grasp at nothing. Resist nothing.'