Bhagavad Gita Verse 14, Chapter 17

devadvijagurupraajnyapoojanam shauchamaarjavam |
brahmacharyamahimsaa cha shaareeram tapa uchyate || 14 ||
 
Worship of the deities, the twice born, teachers and the learned, purity, straightforwardness, chastity and non violence, these are called penance of the body.
 
deva : deities
dvija : twice born
guru : teacher
praajnya : learned
poojanam : worship
shaucham : purity
aarjavam : straightforwardness
brahmacharyam : chastity
ahimsaa : non violence
cha : and
shaareeram : of the body
tapaha : penance
uchyate : called
 
So far, Shri Krishna described the three types of food and worship so that we can use them to analyze the texture of our faith. He now begins the topic of tapas, which means penance or austerity. Through tapas we ensure that the energy that we derive from consuming food can be conserved and channeled into our actions. This tapas or penance is also of three types, saattvic, raajasic and taamasic. But penance itself needs to be broken down into its three main components first. Here, we examine the first component which is bodily or physical penance, shaaririka tapas.
 
Penance of the body begins with bowing down to, respecting, and serving our deities, our elders and our teachers. Deities also means the gods representing elemental forces such as Varun, lord of the seas. This means that we should worship and take care of all the natural resource this world has to offer. Offering service to something greater than us also has the effect of checking our aham, our ego, our illusory notion of who we are. It increases our humility and decreases our individuality.
 
Shaucham refers to purity of our body and our surroundings. If we keep our room unclean or cluttered, it is an indication that our mind is also unclean, or is cluttered with useless thoughts. Aarjavam or straightforwardness refers to our posture. We will not be able to meditate unless we are able to maintain an erect posture. This straightforwardness of the body is also a pointer to making our thinking straightforward, without any trace of deceit. Brahmacharyam refers to stopping our checking the excessive straying of our sense organs into their respective objects, like watching too much TV or consuming a lot of rich food. Ahimsa or non violence prevents us from harming anyone or anything using our body.

Bhagavad Gita Verse 11, Chapter 8

yadaksharam vedavido vadanti vishanti yadyatayo veetaraagaahaa |
yadichchanto brahmacharyam charanti tatte padam sangrahena pravakshye || 11 ||
 
That which is declared imperishable by the knowers of the Vedas, that which dispassionate sages enter, that whose desire leads them to engage in the study of brahman; for you, I shall speak of that goal, in summary.
 
yat : that which
aksharam : impersishable
vedavidaha : knowers of Vedas
vadanti : declared
vishanti : enter
yat : that which
yatayaha : sages
veetaraagaahaa : dispassionate
yat : that which
ichchantaha : desiring
brahmacharyam : study of brahman
charanti : engage
tat : that
te : for you
padam : goal
sangrahena : in summary
pravakshye : I shall speak
 
Having spoken of the technique of meditating upon Ishvara’s form, Shri Krishna now begins the topic of meditating upon Ishvara’s name. This shloka is written in the style of the Upanishads, and just like the previous shloka, is in a different meter.
 
Before the actual technique of meditation is described, Shri Krishna highlights the qualifications of the seeker who is about to perform this meditation. He should be free of selfish desires, likes and dislikes, indicated by the word “veetaraagaahaa”. We have already encountered this word under the topic of karma yoga. Strong passions or dislikes become obstacles in meditation as they push the mind to jump from one thought to the other. Only one who has managed to control the mind can perform such meditation.
 
The seeker should also possess a strong desire to inquire into the knowledge of the eternal essence, indicated by the word “brahmachaari”. The typical meaning of this word, celibacy, is not used here. It is used to indicate one who “moves around” or is preoccupied with the study of brahman or the eternal essence. Most of us, however, are preoccupied with actions. We are “karmachaaris”. Preoccupation with action will also become an obstacle in meditation, as we have already seen in the sixth chapter.
 
Endowed with these qualifications, the seeker is ready to meditate upon that which is considered as the ultimate goal: the imperishable Ishvara or “aksharam”. What is the process by which one can perform this meditation? This is taken up in the next two shlokas.