Henry knew full well that Neuburg was depending on the Austrians and the Catholics, and that the claims of Saxony were only put forward by the Emperor in order to confuse the princes and excite mutual distrust.
The King's conferences with the great financier were most confidential, and Sully was as secret as the grave.

But Henry never could keep a secret even when it concerned his most important interests, and nothing would serve him but he must often babble of his great projects even to their minutest details in presence of courtiers and counsellors whom in his heart he knew to be devoted to Spain and in receipt of pensions from her king.

He would boast to them of the blows by which he meant to demolish Spain and the whole house of Austria, so that there should be no longer danger to be feared from that source to the tranquillity and happiness of Europe, and he would do this so openly and in presence of those who, as he knew, were perpetually setting traps for him and endeavouring to discover his deepest secrets as to make Sully's hair stand on end.

The faithful minister would pluck his master by the cloak at times, and the King, with the adroitness which never forsook him when he chose to employ it, would contrive to extricate himself from a dilemma and pause at the brink of tremendous disclosures .-- [Memoires de Sully, t.vii.

p.
324.]--But Sully could not be always at his side, nor were the Nuncius or Don Inigo de Cardenas or their confidential agents and spies always absent.