Believing that soom good can be derived from every event is a better preposition than that everything happens for the best, which is assuredly does not.
We cannot always control our thoughts, but we can control our words, and repetitionimpresses the subconscious, and we are then master of the situation.
A pessimist sees only the dark side of the clouds, and mopes; a philosopher sees both sides, and shrugs; an optimist doesn't care. Momentum is wht it wants to gather.