दृढ़ता की शक्ति dr̥iṛhtā kī śhakti

दृढ़ता dr̥iṛhtā (hindi)

Fixedness, firmness, hardness, solidity, strength.
Steadiness, perseverance.
Confirmation, corroboration.
Firmness, resoluteness.

का kā (hindi)

का denotes one of the under-mentioned relations between a Noun or a Pronoun and another Noun which follows the former. If the Noun that follows is Feminine (singular or plural), का changes to की; if it is Masculine and Plural, or has an oblique form, का changes to के.

• Possession and relationship.
• Material or composition.
• Worth and measure (space or time).
• Source, origin, cause.
• Subject (doer of an act).
• Object (of an activity).
• Part of a whole.
• Purpose.
• Characteristic.
  (A Basic Grammar of Modern Hindi)

शक्ति śhakti (sanskrit)

Power, strength, potency, energy.
Name of the goddess personifying divine power.
The energy or active power of a deity personified as his wife (as Gaurī of Śhiv, Lakṣhmī of viṣhṇu, &c.)
(Brahma kumaris) Sister, mother.
Śhiv Śhakti, the powers of Śhiv. In Bhakti they are portrayed as goddesses sitting on a lion, swan, lotus etc. They are symbolic of the victory over vices (demons). As power of Śhiv, brothers are Śhiv Śhakti too.