Theory:

Every soul that touches yours -
Be it the slightest contact -
Get there from some good;
Some little grace; one kindly thought;

One aspiration yet unfelt;
One bit of courage
For the darkening sky;
One gleam of faith

To brave the thickening ills of life;
One glimpse of brighter skies -
To make this life worthwhile
And heaven a surer heritage.
 
   ---- Mary Ann Evans (George Elliot)
Explanation:
  
Every person who comes across us in our daily lives makes a difference for us. They may not interact with us entirely, even a small touch, or eye contact - can make the difference. The slightest or the minimal form of contact can also bring us some good virtues. Try to learn something nice from everyone that we meet. We should be able to derive some smoothness in our actions, and kindness in our thoughts, from every contact that we make with others.
 
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Every soul that touches yours...can make a difference!
  
Once we make contact with someone, we may get new hopes about our life. We may not have felt the same goals or ambitions before - it can be totally new. We may get a new streak of courage to face the forthcoming problems. We strive to get a ray of hope, a shining beam of light for the tough times, the increasing problems that we face in life. The ray of hope has been described as "gleam of faith" in the poem.
 
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A gleam of hope, in the darkening skies!
 
One small look or glance at the bright skies will make out lives easier. Brighter skies also refer to the dawn we see after the end of our problems. It makes our lives better and worth living. It makes sure we derive the goodness of the heavens. No one has a right on our heritage or inheritance - it is our possession; similarly, a quick look at the brighter side of life will make our life valuable, and then certainly heaven will become our inherited property.
 
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One glimpse at the brighter skies - to brave the thickening ills of life!
Reference:
State Council of Educational Research and Training (2019). Term-2 English Standard-8. Making Life Worth While - Mary Ann Evans (pp. 98-100). Published by the Tamil Nadu Textbook and Educational Services Corporation.