Wherefore (dio). Because of the exhortation and argument in 2Pe 1:5-9.
Give the more diligence (māllon spoudasate). “Become diligent (first aorist ingressive active imperative of spoudazō as in 2Ti 2:15; 2Pe 1:15) the more” (mallon, not less).
To make (poieisthai). Present middle infinitive of poieō, to make for yourselves.
Calling and election (klēsin kai eklogēn). Both words (klēsin, the invitation, eklogēn, actual acceptance). See for eklogē 1Th 1:4; Rom 9:11.
If ye do (poiountes). Present active circumstantial (conditional) participle of poieō, “doing.”
Ye shall never stumble (ou mē ptaisēte pote). Strong double negative (ou mē pote) with first aorist active subjunctive of ptaiō, old verb to stumble, to fall as in Jam 2:10; Jam 3:2.