Stressors are external events or situations in your life that cause stress. Strain is the negative reaction you have as a result of stressors in your life. Strain includes stress-induced sickness: physically, mentally, and emotionally. If the resources you have to combat stress are greater than the stressors in your life, you can be at peace even if someone else freaks out at the same level of stress. On the other hand, if your resourses to combat stress are less than the stressors, you may have great strain while someone else under the same circumstances is calm.
What are those resources we have to combat stress? There are many, including: positive outlook, friends and family, sleep and times of rest, exercise, proper nutrition, experience. The best resource, however, is God Himself! As Christians, we sometimes forget that the One Who created us is all we need to combat the opposition we face in life. He actually dwells in us! Wow! The stressful situations we face never take Him by surprise. He is there to protect us and give us wisdom and insight that brings perfect peace. It is true! I have experienced it. Have I been stressed? Hah! Of course! But that is my reminder to get my eyes off my stressors and on to my Resource! What is so great is that even when I am bombarded with more stressors, I can have peace at the same time!
You will keep him in perfect peace,
Whose mind is stayed on You,
Because he trusts in You.
Trust in the LORD forever,
For in YAH, the LORD, is everlasting strength. (Is. 26:3-3, NKJV)