Personally Yes, suffering makes us stronger and may lead to success when you pick up the lesson from suffering. There is always potential for growth in suffering. Suffering changes our life from good to best. Pain and suffering are blessings.
Thank you for the interesting question! Friedrich Nietzsche is credited for saying that "what does not kill us makes us stronger." That said, in my humble opinion, my answer to your question is yes and no, which some may consider ambivalent.
Yes, suffering can have a positive effect on the human mind. For example, when we fast or accept pain for religious or spiritual purposes, we uplift the spirit. Also, the mind can be better conditioned to perform optimally by learning from the experience that comes with suffering. How else can we know what is pleasurable, if we have not experienced suffering or pain?
We appreciate situations better if we have experienced the downside.
My second answer is a NO. There are some forms of suffering that are meant to weaken both the mind and body. Unnecessary and meaningless torture aimed at breaking someone's moral or psychological foundation, do not make anyone stronger or successful.
Yes I believe suffering makes is stronger. It builds our resilience and makes us emotionally stronger. During tough times, we feel weak and vulnerable with little self worth, but when we work through those tough times it makes us prepared for the next battle in our lives.