HAVE WE NOT opened up thy heart,1
and lifted from thee the burden
that had weighed so heavily on thy back?2
And [have We not] raised thee high in dignity?3
And, behold, with every hardship comes ease:
verily, with every hardship comes ease!
Hence, when thou art freed [from distress], remain steadfast,
and unto thy Sustainer turn with love.
Lit., "thy breast" or "bosom".
I.e., "the burden of thy past sins, which are now forgiven" (Tabari, on the authority of Mujahid, Qatadah, Ad-Dahhak and Ibn Zayd). In the case of Muhammad, this relates apparently to mistakes commited before his call to prophethood (ibid.), and is obviously an echo of 93:7 - 'Has He not found thee lost on thy way, and guided thee?"
Or: "raised high thy renown". The primary meaning of the term dhikr is "reminder" or "remembrance"; and, secondarily, "that by which something [or "someone"] is remembered", i.e., with praise: hence, it signifies "fame" or "renown", and, tropically - as in the present context - "eminence" or "dignity".