فَسامِحْso be forgiving إذاif ماemphatic particle لَمْnot تُفِدْكَconvey meaning to you عِبارَةٌa phrase
فَسامِحْ إذا ما لَمْ تُفِدْكَ عِبارَةٌ
وإنْand if أشْكَلَتْit becomes obscure يوْماًone day فخُذْهاthen take it كَماas هِياit
وإنْ أشْكَلَتْ يوْماً فخُذْها كَما هِيا
So be forgiving if a phrase conveys nothing to you;
And if one day it seems obscure, take it as it is.
وتَلْخيصُand the gist ماwhat دَنْدَنْتَyou murmured بالقَوْلِin speech حوْلَهُaround it
وتَلْخيصُ ما دَنْدَنْتَ بالقَوْلِ حوْلَهُ
إذاif قُمْتَyou subsist بالبَاقيthrough the Everlasting فمازِلْتَthen you continue to be باقِياabiding
إذا قُمْتَ بالبَاقي فمازِلْتَ باقِيا
And the gist of what you have circled around in speech:
If you subsist through the Everlasting, you remain abiding.