Perseverance is the habit of continuing when something is hard, slow or discouraging. It matters more than talent in most long projects, from learning a skill to raising a family to growing spiritually. It is also tiring, and many people ask how to keep going without becoming rigid or bitter. The Gita addresses this by pairing effort with a calm mind.
Gita 2.40 says sincere effort on the path of selfless action never goes to waste, and even a little practice protects from great fear, so begin with small steps. Gita 8.8 says constant practice with a mind that does not stray leads to absorption in the Supreme, so build a regular practice of focus and gently bring the mind back when it wanders. Gita 18.48 says every work has flaws, as fire has smoke, so do not drop your duty because it is imperfect.
The Gita also describes the spirit of steady effort. Gita 18.26 describes a doer who acts without attachment or egotism, with steadfastness and enthusiasm, and remains unchanged by gain or loss, so combine determination and energy with a calm mind. Gita 17.27 says constancy in worship, discipline and giving is itself goodness, and Gita 8.14 says undivided, uninterrupted remembrance makes the goal near. Gita 10.36 notes that determination is among the divine expressions, so use it with discernment and goodness.