Translation:

235. There is no blame on you if ye make an offer of betrothal or hold it in your hearts. Allah knows that ye cherish them in your hearts: but do not make a secret contract with them except in terms honorable nor resolve on the tie of marriage till the term prescribed is fulfilled. And know that Allah knoweth what is in your hearts and take heed of Him; and know that Allah is Oft Forgiving Most Forbearing.

Notes (Tafseer)

268. A definite contract of remarriage for the woman during her period of 'Iddat of widowhood is forbidden as obviously unseemly, as also any secrecy in such matters. It would bind the woman at a time when she is not fitted to exercise her fullest judgment. But circumstances may arise when an offer (open for future consideration but not immediately decided) may be to her interests, and this is permissible. In mystic interpretation the cherishing of love in one's heart without outward show or reward is the true test of sincerity and devotion.