Shrimad Bhagavad Gita
तं विद्याद् दुःखसंयोगवियोगं योगसंज्ञितम् । स निश्चयेन योक्तव्यो योगोऽनिर्विण्णचेतसा ॥ ६-२३ ॥
One should know that severance of contact with sorrow to be what is called Yoga (which is goal of Dhyana-yoga or meditation). That Yoga has to be practiced with perseverance and with a mind free from despondency.
english translation
जिसमें दुःखोंके संयोगका ही वियोग है, उसीको 'योग' नामसे जानना चाहिये। (वह योग जिस ध्यानयोगका लक्ष्य है,) उस ध्यानयोगका अभ्यास न उकताये हुए चित्तसे निश्चयपूर्वक करना चाहिये।
hindi translation
taM vidyAd duHkhasaMyogaviyogaM yogasaMjJitam । sa nizcayena yoktavyo yogo'nirviNNacetasA ॥ 6-23 ॥
hk transliteration by Sanscript