Chapter 2, Verse 47

कर्मण्येवाधिकारस्ते मा फलेषु कदाचन।
मा कर्मफलहेतुर्भूर्मा ते सङ्गोऽस्त्वकर्मणि॥

Your right is to your work alone, never to its results. Don't let the reward be your motive, and don't fall into doing nothing either.

Chapter 2, Verse 48

योगस्थः कुरु कर्माणि सङ्गं त्यक्त्वा धनञ्जय।
सिद्ध्यसिद्ध्योः समो भूत्वा समत्वं योग उच्यते॥

Act while steady in yoga, letting go of attachment and staying the same in success and failure. This evenness of mind is called yoga.

Chapter 2, Verse 14

मात्रास्पर्शास्तु कौन्तेय शीतोष्णसुखदुःखदाः।
आगमापायिनोऽनित्यास्तांस्तितिक्षस्व भारत॥

Heat and cold, pleasure and pain come and go like the seasons. They don't last, so learn to bear them patiently.

Chapter 2, Verse 20

न जायते म्रियते वा कदाचिन्नायं भूत्वा भविता वा न भूयः।
अजो नित्यः शाश्वतोऽयं पुराणो न हन्यते हन्यमाने शरीरे॥

The soul is never born and never dies. It is unborn, eternal and ancient, and it is not destroyed when the body is destroyed.

Chapter 4, Verse 7

यदा यदा हि धर्मस्य ग्लानिर्भवति भारत।
अभ्युत्थानमधर्मस्य तदात्मानं सृजाम्यहम्॥

Whenever righteousness declines and unrighteousness rises, I manifest myself.

Chapter 6, Verse 5

उद्धरेदात्मनात्मानं नात्मानमवसादयेत्।
आत्मैव ह्यात्मनो बन्धुरात्मैव रिपुरात्मनः॥

Lift yourself up by your own mind and don't let yourself sink. The mind can be your best friend or your worst enemy.

Chapter 18, Verse 66

सर्वधर्मान्परित्यज्य मामेकं शरणं व्रज।
अहं त्वा सर्वपापेभ्यो मोक्षयिष्यामि मा शुचः॥

Set aside all other duties and take refuge in me alone. I will free you from all wrongdoing. Do not grieve.