I've currently finished reading the Bhagvad Gita by Gandhi and here are some of the points I found might be of help in day to day lives.
Impressions of the senses are unreal. Bodies are perishable, soul is imperishable.
As a man casts off worn out garments and takes others that are new, even so the embodied one casts off worn out bodies and passes on to others new.
Here it states that we are immortal beings wearing a mortal body. Our atman, also called as soul is not perishable. It's just that when we die, we move from one body to the next replacing it with a fresh one.
Knowing this makes death a little less scary to us. We learn to accept it when it comes.
When we are possessive, there is violence. We guard things which we think are ours. When giving away a thing to someone, the posessiveness disappears. We no longer regard that thing as ours. All things in this world belong to us but we are indifferent to things because we think some things belong to us and some dont. Gita says that we should give up possessiveness.
Hold alike pleasure pain, gain and loss, victory and defeat, and gird up thy loins for the fight; so doing this shalt not incur sin.
If a person learns to make no distinction between gain and loss, pleasure and pain, he would rarely be tempted to commit sin.
Gita says that we should accept whatever circumstances are thrown at us and keep going without being affected by them.
We should not be too happy when things go according to what we want neither should we be sad when things dont go according to our wants. We should be unaffected by both the circumstances.
The mind of the person of uncertain purpose grows weak day by day and becomes so unsettled that he can think of nothing except what is in his mind at the moment. This does not help us realise the atman; in fact we lose our soul. We lose our dharma, we lose the capacity for good works, lose both the world and the other.
About Sattvic, Rajasic and Tamasik qualities in people:
That action is called sattvik which, being one's allotted task, is performed without attachment, without like or dislike, and without a desire for fruit.
That action which is prompted by the desire for fruit or by the thought of 'I', and which involves much dissipation of energy is called rajas.
That action which is blindly undertaken without any regard to capacity and consequences, involving loss and hurt is called tamas.
The first (sattvik) signifies dedication to God and the second (rajasik) attachment. Because of that attachment one pursues wealth, power and pleasure. The decision of such person maybe faulty.
In tamas, a person plunges into work without thinking of the consequences. That pleasure arising from sleep, sloth and heedlessness is called tamas. It stupefies the soul.
Here it is said that no being on earth is free from these three gunas. Every being has the three in different proportion. We should strive to become more of sattvic and later free of all these.
It seems to me like most of the people in today's world are rajasic as most of us seek wealth, power and pleasure. I myself have been one of these but after reading the Gita, I felt like a weight was lifted off my shoulders. Earlier I used to be of the opinion that we HAVE to make a certain amount of money by certain time else I loose the game. With this I had put a lot of pressure and expectations on myself which I was later relieved of with the help of Gita.