personal reasons

See: motive
References in classic literature ?
If I can come within sword's reach of Sab Than," I answered, "I can solve the difficulty in so far as Helium is concerned, but for personal reasons I would prefer that another struck the blow that frees Dejah Thoris.
Now Tarzan felt no fear of Taug, nor did the unwritten law of the jungle demand that he should flee from battle with any male, unless he cared to from purely personal reasons.
I rather gathered that you had some more definite--more personal reason for my hurrying.
For some personal reason Monsieur Flaubert preferred it.
Van Helsing would, I know, do anything for me for a personal reason, so no matter on what ground he comes, we must accept his wishes.
13 (ANI): VK Jain, advisor to Delhi Chief Minister Arvind Kejriwal on Tuesday resigned from his post, citing personal reasons.
On his twitter account, Johnson confirmed stating, Yes I am making myself unavailable for PSL18 for personal reasons.
Paine has not travelled to Melbourne with the rest of Steve Smith's squad for personal reasons.
Likewise, former federal minister Shamim Siddiqui told the media that he had sent his resignation to London and his decision to part ways with the party was also motivated by personal reasons.
Summary: The board will elect a new chairman in the upcoming meeting after Majid Saif Al Ghurair resigned for personal reasons
Chinese insurer, Anbang Insurance, has reported that its chair is not in a position to work because of personal reasons.
TV actor Fakhr-e-Alam resigned his job as Sindh Board of Film Censors chairman, citing personal reasons.

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